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Consider dehydrated water. Much lighter.
edit on 10/8/13 by AnonymousCitizen because: (no reason given)
There is no magic BOB formula unfortunately. Depends who you are, where you are, what you know, what you have planned.
Some basics though...
One is none for important items. Two is good. Three is better.
Dual purpose items. The more a thing can do, the better it earns its place.
Practice with it. Carry it. Hike with it.