I've read about Cryptosporidium in tap water.
Some bottled waters contain natural or added carbonation.
There are several different varieties of bottled water. The product may be labeled as bottled water, drinking water or any of the following terms. Drinking water is another name for bottled water. Drinking water may be sodium-free or contain very low amounts of sodium. Mineral water is distinguished from other types of bottled water by its constant level and relative proportions of mineral and trace elements at the point of emergence from the source.