You can get your Alchemist to make different potions when you camp if you save right b4 you camp and then reload the game and camp again. So if you didn't want that potion of light healing, just reload and try again.
I haven't experimented with it too much so I don't know how much is based off you character's Alchemy skill, in terms of how powerful of a potion he can make. Seems pretty random though.
~l8er
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