@platorepublic,
I live in Milwaukee. After the Cryptosporidium outbreak in 1993, the city updated the entire system where the water is first cleaned with ozone which greatly reduces the amount of chlorine used in the process. We also get the majority of our water from Lake Michigan. Of course, not all areas are as fortunate. There is a reason why the Southwest is trying to access the Great Lakes for drinking water.
Many studies have been done on the quality of bottled water, and it has largely been found to be at the same level or inferior to the quality of tap water. In some cases, companies are taking tap water, bottling it, and then selling it at an extreme markup. The cheapest way to get quality water besides the tap is investing in good containers for water, and going to the grocery store and filling off of their reverse osmosis system.
Oh and by the way, Polyethylene terephthalate (PET) is likely rather toxic and can affect the endocrine system. There is growing evidence that it is quite toxic and will lead to cancer. Thus, much bottle water is probably more dangerous than tap water in the developed world.