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I would probably ask your doctor about that, or it should be in the pamphlet he gave you. An internet forum probably isn't the best place to ask that type of question
Full disclosure, I'm not an MD.
Generally, if you have to ask if it's okay to drink after a procedure or during treatment, the answer is no unless expressly approved by the guy who did the cutting.
I faintly recall an nrotc bud of mine (who had just gotten prk) bringing a girl over to our house for drinks under the auspices of him being blind and stuck at home from the surgery, and yet bagging her later in the evening. So I'd say you can do either following prk (he flies Navy helos now)
I consumed a few adult beverages after PRK while still on the steroid drops to no ill effects. That being said, most people seem to be prescribed different things. I don't know what your on, so you should probably ask the MD.