Water boy
Encyclopedia
In the USA, a water boy (sometimes spelled waterboy) is someone who works on the sidelines
Sidelines
The "sidelines" is a term commonly used to define the white or colored lines which mark the outer boundaries of a sports field. American football sidelines, for example, mark the edge of the field. Should a player pass through the sidelines, he is considered out of bounds...

 and provides water
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...

or other drinks to athletes. Also known to wear number 00.
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