Now you may be wondering,''How can water bottles harm you? How can you get cancer? What makes water bottles so dangerous?'',Well we may be able to answer these questions for you. Bottles can harm you just by you drinking them. We are not saying your not aloud to drink them but you cant drink them if they were left out side in the heat or frozen in your freezer. If you do this in the hot or cold the plastic will release a toxin that can possibly cause cancer, mostly breast cancer. The different water bottles companies use different plastics in their bottles. Some use safer ones than others do. The companies that do not use the harmful plastic can prevent this disaster from happening or someone you know. So the next time your about to pop that seal for your next sip, make sure it is not an old one you left outside when you were playing basketball or the one your mom told you to freeze for later.