I have been kicking around the same country for about a decade longer than you, and I would say that your requirement of a gallon of water is completely reasonable. There have been times when I have carried too much water, but I don't remember them nearly as vividly as those times when I did not carry enough water. At least I am still around to remember them <img src="/forums/images/graemlins/grin.gif" alt="" />

At GCNP they used to say, "A canteen carrying less than a gallon water is just a toy."