Aquena, the safety of your water may be an illusion. There have been numerous exposes of "bottled spring water" coming from municipal water supplies. When I lived in Pennsylvania several years ago, one popular local brand was coming from a garden hose attached to a faucet at someone's barn!
Take a look at some of these sources:
www.ewg.org/reports/bottledwater
www.nrdc.org/water/drinking/qbw.asp waterquality.cce.cornell.edu/bottled.htm