D20:Brew Potion Feat

Caster level 3rd.

You can create a potion of any 3rd-level or lower spell that you know and that targets one or more creatures. Brewing a potion takes one day. 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. The base price of a potion is its spell level × its caster level × 50 gp. To brew a potion, you must spend 1/25 of this base price in XP and 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.
Any potion that stores a spell with a costly material component or an XP cost also carries a commensurate cost. In addition to the costs derived from the base price, you must expend the material component or pay the XP when creating the potion.

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System Reference Document -> Feats