If the leeching of chemicals from plastics into water is such a problem, maybe we should look into the bottled water industry. Based on the volume of sales of these products, there would appear to be a greater risk there.
Hey, soft drink and fruit juice products are primarily water, so what about them. And by the way, many of them contain chemicals which may enhance the leeching process.
I raise these possibilities because I think the whole issue is much ado about nothing.
I love the irony of this whole issue. The idea of paying the cost of bottled water would have sounded ridiculous except maybe in the last 15 years or so...now it's standard operating procedure. First it was only yuppies that bought it, now they've moved on to the gourmet brands, and even the vast unwashed drink bottled water. And after all that, it's the container that's poisoning them all, not the water 8^).
I would guesss it'a a bit overblown, but when something tastes like the container, I think that's a warning sign, especially when the materials making up the container look like a chem lab test.
I bought a stainless steel cup a few months ago, with a carabiner handle for belt clipping; works great for stream-dipping, and stainless steel seems like it would remain intact, in the cup itself, not polluting what it contains.
As for soda, I'd think the 9 teaspoons of sugar or the phony sweetener would be a far greater threat to anyone's well-being than anything the container could add. If you're going to drink that stuff, why worry about it?