"What do you want to drink?"

[arctaco]

why wouldn't "Qual" work here?

[Paulenrique]

O que você quer beber? = what kind of drink/beverage do you want? / qual você quer beber? = which one do you want to drink?

[LauraWilso110403]

"O que você gostaria de beber?" is also correct.

[microgriff]

can anyone explain why and/ or when you have to put the 'o' in front of some words like in this sentence ? ? thanks in advance..

[Paulenrique]

to form "what" in Portuguese you have to use two words: what = o que.

[zeclips]

"O que é que tu queres para beber?"
Esta resposta nao deveria ser aceite?

[Paulenrique]

Also right.