Most "one-use" plastic bottles are made out of a plastic called polyethylene terephthalate or PET.
Other "re-usable" plastic bottles aka Nalgenes are made out of Bisphenol A aka BPA.
There is a lot of debate about the potential human dangers to drinking out of a bottle that contains BPA.
Potential Dangers:
In August a government panel expressed concern that BPA's can leach into the liquids causing neural and behavioral problems in children. Especially, since BPA's leach into hot liquid 55 times faster.
It is thought to block male hormones at high levels and acts like estrogen at low levels.
The Environmental Impact:
By switching to a reusable bottle, you're keeping about 168 plastic bottles out of landfills every year!
• Tap water creates less pollution and uses far less energy and natural resources than the transporting and
manufacturing of plastic water bottles.•Bottled water costs as much as $10 per gallon—tap water costs less than one cent per gallon.
• Nationally, local governments spend $43 billion per year to deliver some of the highest
quality water in the world.
•Nationally, only 10% of plastic water bottles are recycled—90% end upas either garbage or litter.
• We spend millions annually to clean up plastic
bottles that litter our highways, parks and
open spaces.
So... What Materials are Good to Drink out of?
Stainless Steel or Glass
Neither of these materials will leach into the liquid that they are containing.
Resources:
The overall summary is drink water for health not for toxins!