BPA is an ingredient found in a lot of hard plastics, and it is a highly-toxic ingredient. It’s also called Bisphenyol A, BPA is the short term for it, and it’s something you definitely want to avoid. Unfortunately, it’s found in a lot of water bottles, including all hard water bottles, the water bottles that are made out of polycarbonate. Any plastic that has the number seven on the bottom of it is likely to have BPA in it so you should avoid it. BPA is also commonly found in the lining of most canned food goods.