Irrelevant.
Water from a tap != a bottle of water from the fridge.
Bottled water is equivalent to any other bottled drink and should be treated the same, it is not solely equivalent to what comes out of your faucet. If I'm prepared to pay for a bottle of water instead of a bottle of cola that's my choice. To educate people on the fact that water from the faucet is (meant to be) just as good as water from a bottle is one thing, to ban the healthiest bottle while leaving other bottles available instead is absurd.