A word of caution...

Chilled drinks are bad for the voice when singing, as they have an anaesthetic effect... which is why they seem  like a good idea.

Unfortunately, the combination of cold and anaesthesia means permanent damage can eventually occur... dirnks which are too hot are also not a good idea.

Fizzy drinks can cause acid reflux, which is also detrimental to vocal cords.

Oh dear... there doesn't seem to be much left... plain water at room temperature is fine... as long as it's clean!