"What do you drink?"
Translation:Was trinkst du?
Well for starters, you would say "was trinkst du" instead of "was du trinkst" given that you are asking a question (verb before subject when asking questions). In this specific case, since du isn't given as an option, you have to deduce that you are not speaking to just one person. Since "ihr" is the only logical pronoun left, you should say "was trinkt ihr" (what do you [all] drink?) Hope this helps, :)