John is right--it's a racket. What would make it more dangerous for the 2nd or the 200th drink that it didn't have in the first drink? If you put water in the bottle and heat it a lot, you might shift some chemicals, but no one is suggesting that we do that. Using plastic at all is a risky proposition, considering all of the environmental damage the production (starting with oil extraction) does. Reuse is your best hope to discourage them from making more bottles.

Here is an intersting article, along with the others.

Wash your water bottles and caps in the same dishwater you was your plastic cups, coffee mugs, dishes in general in. Swish it well, let it drain. I don't cap bottles and put them away with droplets of water still in them. Let them dry completely first.

SRS