Yep, but their point was to kill the microbes with UV, not heat. As I understand it is sustained heat and a closed plastic container that gets the leaching chemicals to a level that you can taste. Also, if you are using plastic to make relatively dirty water safe, the least of your worries is a slight leaching of plastic in the short time it sits in the bottle exposed to ambient ultraviolet. OTOH if you have Arrowhead bottled water sitting in your trunk all summer, at the end of August it won't taste as good as when fresh. It's all relative.

I'm thinking a Brita filter used on either after sitting in the bottle could improve the taste.