He was probably correct with his statement that the Giant bottle doesn't leach out toxins in hot weather (and certainly correct that it contains no leeches). Did he indicate that the $4 bottles he sells do have a problem with toxins? If so why does he sell them? I'd expect the Walmart bottles to be safe as well.

There's been a lot of discussion about plastics containing BPA, with inconclusive studies about any harmful effects. But that chemical isn't an issue with the squeezable bike water bottles. BPA was used in the making of older hard-plastic Lexan bottles, not the soft plastic ones.