Why buy water bottles when you can get used ones for free? Actually, in Oregon they cost 5 cents (the deposit), but that's no big deal. Smart Water bottles last for a long time and, if you want a wide-mouth version, so do the Kroger "Simple Truth" organic juice bottles. Even if you count the cost of the original beverage (which presumably you will drink), they are still far, far cheaper than any commercial bottle, and lighter than most.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey