Looks like those plastic water bottles might not be so good for your health. Plastic baby bottles too …
Mountain Equipment Co-op is pulling them off their shelves as we speak – proactively. Nothing proven yet but the concen is there.
Here’s a Wikipedia article that provides a little more info on the Nalgene connection – some of their bottles contain less of the suspect chemicals than others.
As for using the bottles out of their intended temperature operating ranges … I don’t know of anyone using the obttles for freezing water, do you? Is that out of their intended operating range I wonder.