After an episode on AA where the crew member kept refilling my G&T without me noticing, and then getting up mid flight and feeling that the plane was going into a terminal spin, I've restricted myself whatever airline I'm flying.

I may have a pre-dinner drink (if offered, a lot of airlines seem to bypass that now!). I'm not a great fan of wine so will skip that - unless a nice beer is being served (rare) and I may have a port with the cheese course. Then it's water or juice or maybe a coke for the caffeine/sugar hit on a long haul.