Bisphenol A
There’s some research to suggest that this chemical, commonly known as BPA, found in some plastic water bottles, can leach into food and drinks, and may pose health risks especially to infants and children, according to the National Institute of Environmental Health Sciences. Luckily, more and more BPA-free bottles are available now. (However, some caution that even BPA-free plastics may still leach unwanted chemicals into your water when exposed to sunlight or microwaves or dishwashers, NPR reported.)