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Most data centers I've worked in have backup batteries and generators. This works well when the power is off. I was working at a big bank in a major metropolitan area that had a water main break nearby. No water meant no chillers. No chillers meant no cooling. No cooling meant all the systems got shutdown. In a big bank this meant all the online systems came down like ATMs, wire transfers, check processing and the brick and mortar branches.

After a few hours the big bank officers convinced the city to get a fire truck to lay fire hose from the nearest working hydrant to the chillers. This let us everything back online until the water main was repaired.

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We're budgeting water wells for backup incase a main breaks in a few jobs we're working on...

(Also, it's the cooling towers that need all the water, not the chillers, chillers run in a closed loop. Now air cooled chillers you would need no water at all, except they're energy hogs)