Well, water here might be bad or not. I don't drink tap water for about 2,3 years, but back then i remember i had very often tummy aches and since i stoped drinking it, i feel better. But it might be just me, my stomach's very sensitive
However, back in Romania, the main type of water we drink is en-riched (is that a word?) with CO2. Borsec, my water of choice was voted best water in the world last years. It's about 6000 lei a litre (about 0.16 euros) Pretty good.