I don't really drink, I'm really trying to cut down sugar, and I usually sleep on planes, so it's whatever diet non-caffeinated soda they have, if they have one or water if not.

Except on QF, where as I recall, they have Bundaberg Ginger Beer, but not the diet version thereof -- that's worth the sugar -- and occasionally a Cathay Delight on CX.

Once in a very great while when flying in J, I'll have some red wine or a port if they have one.