BPA

A NY Times article reports "a chemical called bisphenol A, or BPA...is a synthetic estrogen that United States factories now use in everything from plastics to epoxies to the tune of six pounds per American per year. That's a lot of estrogen. More than 92 percent of Americans have BPA in their urine...." BPA can be found in canned foods and beverages, likely from the packaging.

Best quote: "When you have 92 percent of the American population exposed to a chemical, this is not one where you want to be wrong," said Dr. Ted Schettler of the Science and Environmental Health Network. "Are we going to quibble over individual rodent studies, or are we going to act?"

http://www.nytimes.com/2009/11/08/opinion/08kristof.html

My favorite water bottle (as I mentioned on a LinkedIn comment discussing "Made in USA" patriotism) is the Nalgene BPA free plastic bottle. It has a large mouth so you can put ice in it, and it is clear enough that you can fill it from the fridge dispenser without overflowing. Bonus is that it IS made in the USA.