You either cache it, horse pack it in, 4 wheel it in, detour your hike each day to a road where you can bring a car with water, or you carry it.

For carrying: assign 4 boys a day to carry the bulk of it on a stretcher. Pull a cart if the trails allow it. Or each carry 3 gallons. Gallon milk jugs are probably going to be the lightest solution.
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