I have built a lvl 20 fighter with the ability to chug potions/Drinks as a swift action. I don't remember how I got that power, but as best as I remember it applies to all drinkable substances. What are the best potions he can get with a dedicated budget of 100,000 gold (left after other gear)? He needs to be able to have multiple of potions and they need to heal as much as possible each round.
I have built this character to chug potions as a rule of cool and it is part of the personality and he is only meant to be a one off character who fights a member of our party.
As this is a lvl 20 character he will have the gold, resources and contacts needed to have just about any level caster of whatever specialty he needs to make the potion for him.