Wandering_daisy wrote: "There also are specialized plastic bags that do not "bleed" plastic into samples (if you are also worried about carrying backpack food in a bag)."

I would love a perfectly safe camelback type bladder, and a real cooking pot (instead of trying to use a water bottle as a pot), but even if the modern bladders don't impart a taste into the water (or so I've read, on amazon), I still don't trust that they wouldn't leach odorless/tasteless bad stuff. How do I know if one of the water bladder manufacturers uses this special plastic?