In "The COMPLETE Professor Q's Wizard Guide" (but elsewhere too) you can read that one of the familiar roles can be an alchemist.
Roles for Familiars
Alchemist: This can get a little expensive, but it’s an option you should consider since these are really effective actions your Familiar can take and could mean the difference in a battle. You’re definitely going to want to max out your alchemy skill too, not only because the best alchemy items are DC 25, but also because you’re going to want to get the ⅔ discount.
I just do not understand how that works. Is this just about my wizard creates with Craft Alchemy anything and hands it over to the familiar who can use it at the battlefield? Example: I give my eagle alchemist fire and he drops it on the battlefield (Here I do not know why the family knows where to drop the fire anyway. Is he doing this by himself (he as a good int for an animal) or do I have to give him instructions?)? Or can the familiar use the Craft Skill by itself? Would be great if anyone could help me understand this familiar role.