There are specific questions we are looking to answer which may be found in difficult to locate places.
A good place to start is with the US Government's science portal:
Science.gov
Here are some helpful hints for answering these questions:
HOW DO WE KNOW IF OUR WATER IS SAFE?
US Food and Drug Administration
US Environmental Protection Agency (US EPA)
US EPA Report on Bottle Water
US EPA FAQ about bottled water
US EPA regulations on drinking water
WHAT ABOUT FLUORIDE IN WATER?
Centers for Disease Control and Prevention (CDC)
Data from CDC on fluoride
WHO IN WISCONSIN REGULATES BOTTLED WATER?
Wisconsin Department of Agriculture, Trade, and Consumer Protection
WHO IN WISCONSIN REGULATES CONTAMINANTS IN DRINKING WATER?
Wisconsin Department of Natural Resources
ARE THERE CONTAMINANTS IN MY WATER?
US EPA Drinking Water Contamination
WHAT ARE SOME RESEARCH PROJECTS ON WATER QUALITY?
US Department of Agriculture, Water Quality Information Center