Alcohol isn't available in any of the inflight bars, as passengers cannot serve themselves alcohol. Although J will have wine bottles, it's purely for crew to stow them. If you want a glass, you'll need to ask. I know it happens on the 747 too but the same rules apply there as well - you cannot help yourself to alcohol.

Y class bar have soft drinks and snacks. In addition to the snack bar, Snack on Q bags will still be given on applicable flights (10 hours plus)

Every cabin except First has it's own self service snack bar.
4 in Y
1 in PE
3 in J.

First has refreshments from the menu.