Much as I hate to do anything so silly as to purchase bottles of water, we occasionally get the bottles of Poland Spring with the squirter nozzles. The squirter prevents backwash, so they can be refilled indefinitely without being cleaned. The plastic of the bottle feels really flimsy, but we've never had one fail. I like having a semi-disposable canteen that I don't care if I lose it. I also like the squirter to possibly cleanse wounds.

David