Despite this week's FDA announcement about the safety of BPA, it seems to me that ingesting weird chemicals is probably best avoided.
Several types of plastics seem to be safe, but The Good Human blog offers tips on choosing the safest reusable water bottle.
Interestingly (and I'm no expert), this is the first time I've seen anything resembling a non-hoaxy explanation of why to avoid #1 PETE plastics. After repeated use "this kind of plastic has been proven to leach DEHP (Bis(2-ethylhexyl)phthalate) which "is a probable carcinogen". DEHP is a phthalate, one of the toxic plastics that has a pretty bad rep.
Another blog, National Geographic's The Green Guide, mentions a 2003 Italian study that found increased of DEHP in water stored in PETE bottles for 9 months. Okay, easy: don't store water in a PETE bottle for 9 months.
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