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Ooh, you touched a sore spot. I know the research, I do it. Show me some real evidence (= data, not heresay) that any harmful chemicals leech from a Nalgene bottle at any biologically relevant concentration and I'll retract my assertion that you are dead wrong. Shoot, I'll even lower the bar and eat crow if you can find good data for an off-the-shelf bottle made of PVC or polystyrene that leaches significant levels of plasticizer or styrene monomer.
"Chemicals" is not a dirty word. Everything around us is made of chemicals. Parroting the claim that bisphenol-A is harmful is very misleading, since "harmful" is a relative thing. Harmful at what concentration? Bleach is harmful too, it kills nearly all microorganisms in under 1 second. But I will drink bleach at a concentration of 1 nanomolar (same order of magnitude as 1 part per million in a water volume, IIRC) and have no ill effects. In fact, I do. We all do.
This all stems from a misunderstanding of the basic chemical nature of things. Concentration matters. Kinetics matter. Bioavailability matters.
I'm responding in an aggressive way because you responded in an aggressive way to previous posters, and I've found that aggressive people tend to respond best to aggression. Still, I think it is good to maintain some level of mutual respect, and I refrain from calling you ignorant or lacking an informed opinion...as you did to the previous poster.
You are probably an intelligent, caring human, who has simply not been exposed to good science or discourse in this area. Here's your chance. Prove me wrong! Open your mind, construct a hypothesis, and then try to disprove it with good data. If you want to truly convince people instead of brow-beating them...you must do so with respect.