You can create magic potions.
Prerequisite: Caster level 3rd.
Benefit: You can create a potion of any 3rd-level or lower spell that you know and that targets one or more creatures or objects. Brewing a potion takes 2 hours if its base price is 250 gp or less, otherwise brewing a potion takes 1 day for each 1,000 gp in its base price. When you create a potion, you set the caster level, which must be sufficient to cast the spell in question and no higher than your own level. To brew a potion, you must use up raw materials costing one half this base price.
When you create a potion, you make any choices that you would normally make when casting the spell. Whoever drinks the potion is the target of the spell and spells with a range of personal cannot be made into potions.
See magic item creation rules for more information.
Can a character with Brew Potion create a potion of any spell he knows simply by adding +5 to the DC, even without preparing it?
No. When creating potions, the crafter must prepare and expend the spell used by the potion as part of its creation. This is an exception to the normal rules that allow a caster to skip one of the prerequisites for crafting an item by adding +5 to the DC.
Pathfinder RPG Core Rulebook. Copyright 2009, Paizo Publishing, LLC; Author: Jason Bulmahn, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.