I know this probably won't be well received. The problem with bottled water is that the bottles are often discarded after they are used. Yes, they are easy to carry and safe. But they're also easy to toss and that hurts all of us. A canteen or other aluminum container is still good enough and if you like to drink a lot of fluid, or fear you may need more then 1 container, I guess you should get some type of purifier.

Allan