In talking about the size of the reservoir in New York's Central Park, my friends and I couldn't seem to find the correct verb to describe what a reservoir does for a city.

What is the verb for "to provide with a drink".

E.g. "The farm feeds the city, the reservoir _____s the city".

Hydrates is close, but it's only for water. Is there a nonspecific verb in English for this action?

Any ideas?

Dan G.