As far as I know, all of the Gatorade, soft drink and water bottles are Polyester (PET). I think that most caps are Polypropylene. Nalgene makes LDPE water bottles and probably makes Polypropylene laboratory bottles, but I don't know if they make high temperature water bottles. The REI Nalgene bottle is made from "Eastman Tritan Copolyester" And is claimed to be Dishwasher "top shelf only" safe. The Vapur Element collapsible water bottle is laminated and claims to be dishwasher and freezer safe. I'm not certain that any of these will be satisfactory with near boiling water.