If you haven't, here's my advice: Don't fucking do it.
I drank yesterday and holy smokes I feel like shit now. I've never had a hangover in my life, sometimes a very mild headache but really nothing serious.
Today is horrible. I can't eat, I feel like throwing up all the time, I'm tired but can't sleep...and I didn't even drink that much.
Read up a bit on alcohol during keto and it seems that the hangovers are insane...agree.