According to studies done, it was found that bottled water contained an average of eight chemicals that are harmful to your health. One in particular is trihalomethane, which has been linked to liver cancer. If that does not convince you to purchase a refillable container such as a Camelbak Water Bottle, then consider the plastic bottles that purchased water comes in. Cleaning agents, heat and UV rays tend to produce BPA to permeate into the bottled water. This is a carcinogenic also found to lead to long-term medical problems.