There is an ongoing debate as to whether plastic water bottles, and many plastics in general, are safe to use for food and liquid storage. One of the major issues centers around the chemical Bisphenol-A. It is used in the production of polycarbonate which is then manufactured into plastic bottles, food storage containers and lining used on the inside of food cans.
Bisphenol-A, an artificial estrogen, can cause adverse affects in people even in low doses. Some of the health issues being looked at include obesity, decreased testosterone, immune system problems, aggressiveness and impaired learning ability.
On most plastic containers (usually on the bottom) you will find a recycling symbol with a number in it. This number tells you what type of material was used to make the item. Knowing the number you can then track down how safe that particular type of plastic is for food and beverage use. You can learn more about what each number means and which ones are safe for food and beverage use by reading the article on Health Risks With Plastic Containers.
More resources relating to plastic safety with food containers and water bottles:
If plastic containers worry you there are alternatives available. Klean Kanteen makes a wide range of plastic free products including sippy cups for children.
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