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Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Momento Magica (Magic Item Compendium, p. 164) allows you to regain a spell slot you have used. It actually works on slots, not spells, and does not have any limit on the way you spent your slot.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, Sublime Chord PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful for you. You are a spontaneous caster, and these items works for prepared spells. And even if you somehow find a way to prepare, they are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.

Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Momento Magica (Magic Item Compendium, p. 164) allows you to regain a spell slot you have used. It actually works on slots, not spells, and does not have any limit on the way you spent your slot.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, [Sublime Chord][10] PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful for you. You are a spontaneous caster, and these items works for prepared spells. And even if you somehow find a way to prepare, they are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.

Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, Sublime Chord PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.

Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Momento Magica (Magic Item Compendium, p. 164) allows you to regain a spell slot you have used. It actually works on slots, not spells, and does not have any limit on the way you spent your slot.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, Sublime Chord PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful for you. You are a spontaneous caster, and these items works for prepared spells. And even if you somehow find a way to prepare, they are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.

Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom will help. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, Sublime Chord PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.

Simplest answer is Extra Spell Slots feat. It is not quite on the list of your allowed resources, but it is published by Super Genius Games, the same publisher that created Spellhammer archetype you are already using, so you will probably be good to go.

Another option are Rings of Wizardry with Alternative Source Spell feat from Dragon #325 - feat makes your casting arcane or divine, whatever you wish, and ring doubles your arcane spell slots at given spell level. Some 3rd party sources, like Gary Gygax's Necropolis, contain magic items that cost and works exactly like Rings of Wizardry, but under different names, on different body places (like amulet), and for divine casters. That way you don't even need a feat or anything. You can consult your DM about it - power-wise it shouldn't be a big issue.

Bonus Spells from ability score are natural way to increase spell slots, too. For every point of modifier increase, you (potentially) get slots for higher spell level, and for four points - more slots at the levels on which you already have bonus spell slots. So increasing Wisdom whenever you can should work. In addition to increase by level, you can use items and spells that boost your Wisdom. Headband of Inspired Wisdom, Periapt of Wisdom etc. Sadly, Owl's Wisdom explicitly excludes bonus spells from the list of it's benefits. Wish and Miracle do not.

Last option is to get a lot of new spell slots from totally other class. You will loose a lot of Inquisitor's original fluff that way, so I wouldn't really bother, but here goes what I can think of:

1. Fochlucan Lyrist requires only one level in another base class, but a lot of tricks for other requirements. But it's casting is 10 + 10 / 10, so it has the lowest spell level / spell slots drop possible.

2. Mystic Theurge has easier requirements, but requires 3 levels in other base class - unless you use Alternative Source Spell feat to game the rules

3. Again with Alternative Source Spell, Sublime Chord PrC could give your character full casting progression. But too much requirement play - possible in theory, but hardly practical at all.

Note that Mage's Lucubration and Pearls of Power are not useful directly:

recall any one spell that she had prepared and then cast

prepare any one spell of 5th level or lower that you have used

As you can see, both requires you to actually use a spell, not a spell slot, so without some rule-bending wouldn't work on spell slots spent on Spelldrive. So they can help to save spell slots when casting spells, but that's all.