What would you like to drink?

What are you drinking?

What would you like to drink? Used as an offer to buy that drink for the other person. A: "Hey, I haven't seen you around this bar before. What are you drinking?" B: "Oh, no thank you. I'll sort myself out in a bit." The first round is on me—what are you drinking?
See also: what
Farlex Dictionary of Idioms.

What would you like to drink?

an offer to prepare or serve a drink. Bill: Come in and sit down. What would you like to drink? Andy: Nothing, thanks. I just need to relax a moment. Waiter: What would you like to drink? Alice: Do you have any grape soda? Waiter: I'll bring you some ginger ale, if that's all right. Alice: Well, okay. I guess.
See also: like, what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • What are you drinking?
  • What are you having?
  • name your poison
  • What's your poison?
  • into the drink
  • be in the drink
  • pick your poison
  • belt a drink down
  • drink (someone) under the table
  • drink someone under the table