。
She asked for something to drink.
Literal
She [topic-は] something drink [object-を] please [quotative-と] requested.
なにか飲み物を下さい ('please give me something to drink') is the literal content of her request, framed as a quote with と and the verb 頼んだ ('asked, requested'). This is a textbook example of direct speech reporting: と quotes the actual words. Compare with the indirect form 飲み物が欲しいと頼んだ or 飲み物をくれるように頼んだ. なにか ('something') is the indefinite built from なに + か, parallel to だれか ('someone'), どこか ('somewhere'). 飲み物 itself is a [verb-stem]+物 nominalisation — 'drinking-thing,' i.e. drink.