How much fuel to carry for melting snow?
I'm using a multi fuel stove (MSR Dragonfly) for a 10 day ski tour, how much fuel should I allow to provide sufficient water for cooking and drinking. Meals will be mostly dehydrated just-add-water types. I'm not expecting to need much (any) for washing!
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10 inches of snow will give you 1 inch of water. Lets say you need to fill your container half way full to get a cup of water, well that means you're going to have to fill it full 5 times to get that cup, melting it each time. I usually budget about 4-5 times the fuel in the winter than I use in the summer.
You can speed things up by pouring a bit of water in the bottom to begin with, and it'll also avoid the bottom of your pan scorching.
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I've heard from numerable places that when climbing Denali, plan on a cup (About .25 L) of white gas per person per day. I would say that this should be a good rule of thumb for your trip as well. You might be able to get away with a bit less, but this is at least a good rule of thumb.
You probably won't need this much, but it's a good rule of thumb still. Denali has additional challeneges, with the altitude it has, and from what I've heard, most climbers come down with extra gas.
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