Atrazine levels in water are highest in spring and summer, when farmers are spraying their fields, and kids get hot and drink a lot of water. European countries do a much better job of protecting their children from atrazine. It's banned in many countries, including Germany, Italy and Sweden. Debugging the clean water myth. In this country, cities purify drinking water by using sedimentation, filtration, ion exchange and disinfection.
Disinfection uses ozonation and, particularly, chlorination to kill disease-causing microbes.
Chlorine, once the salvation of the twentieth century, controls cholera, typhoid fever and other water-borne diseases. Bottled water may not be your answer. Bottled water is regulated, but not stringently. It's only requirement is that it is as safe as tap water. It may be nothing more than filtered tap water from some municipality.