In the US, 2 would be the one most often heard. 3 is an acceptable alternative, less often heard. 1 is also possible, but would be the least often heard.
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lucas21cThey are questions used for asking a cup of water of a flight attendant on the plane.They are questions used for asking for a cup of water of a flight attendant on a plane. You don't need the because you have not mentioned a particular plane.