I have made up the sentences below.
(1) I'm very thirsty. Bob, I'm happy you're going to shop at the store over there. I'm not sure what I want to drink.
(a) You can just get me four cups of drink.
(b) You can just get me four cups of drinks.
Some of my non-native friends think "drink" in singular form is correct because it's uncountable. My other friends think "drinks" in plural form is correct. Which one is correct?