2. Bottled Water
First of all, the water in bottled water may actually be from a municipal source no matter how pretty the picture of a mountain stream on the label.
But the most harmful element of bottled water is the bottle itself. Not only is discarded plastic an environmental disaster, it also leaches dangerous chemicals into whatever it touches.
One notable example is bisphenol-A or BPA. This chemical is used in many plastic water bottles despite the fact this it is a known hormone disruptor that increases the risk for prostate and breast cancer as well as metabolic disorders.