Most people discussing tap water have little understanding of the EPA regulations concerning the production of drinking water. Bottle water actually has fewer standards governing it's quality due to the fact that bottled water is governed by the FDA. Also, most faculities in the US now have declorination procedures as per the EPA regulations. I believe the maximum clorine levels in drinking water were almost cut in half a few years ago after research proved that concentrations over a certain level increase risk of cancer in humans. Alot of newer faculities (and retrofitted older faculities) are going to UV sterilization these days. Interesting stuff.

Most of your 'purified' water is just tap water that has been run through a few more mineral reducers to get rid of taste. Nothing special.

Funny thing about tap water is that the majority of the contaminants come from the system after it is processed (i.e. soil/groundwater infiltration into broken pipes or you don't clean the green slime out of the inside of your faucets (yep, it is in just about every one ))

I never take the water stuff too seriously......we are keeping reptiles....not fish....unless the water has rat poison in it....we are good to go