Craft (X) is on most class skill lists, IIRC. I would imagine that most alcohol requires a craft (brewing) check or somesuch, although someone trained in alchemy could probably manage a tub of moonshine without much trouble. Certain... unsubtle concoctions must have a fairly low craft DC.
Definitely put a cap on the value and shelf-life of the liquid produced. You might allow Potion of Cure Minor Wounds for a little extra utility.