Depends if you’re looking to (1) quench your thirst, (2) drink something tasty, (3) get a nice buzz, or (4) get wasted and enjoy a morning-after hangover.
(1) Water or some kind of soft drink.
(2) Maybe some sort of exotic iced tea, or special roast or blend of coffee warning: caffeine won’t keep you sober, it will just keep you awake when you get drunk
(3) A few beers, mixed drinks of your choice. You probably want to have something to eat as well.
(4) A shot and a beer, a shot and a beer…and a shot and a beer, and a shot and a beer…