Water bottle in cafeteria (7)

I believe the answer is:

canteen

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This could be a double definition.

'water bottle' is the first definition.
'canteen' can be an answer for 'bottle' (canteen is a kind of bottle). I'm not sure about the 'water' bit.

'cafeteria' is the second definition.
(I know that canteen is a type of cafeteria)

'in' is the link.

Can you help me to learn more?

(Other definitions for canteen that I've seen before include "Works'' restaurant - cutlery" , "Set of cutlery" , "A case of cutlery" , "Institutional eating place" , "Office eating area" .)

I've seen this clue in The Sun.

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