San Francisco’s water used to be quite good - it came (still comes?) from the Hetch-Hetchy reservoir in the High Sierras, a few valleys over from Yosemite.
I've been drinking S.F. tap water for over twenty years and I'm still not gay. And the taste hasn't changed either. I support this move by the mayor. Bottled water is a luxury. The taxpayers should not be forced to provide such for the city employees. If they don't like S.F. tap water, they can bring bottled water of their choice to work with them.