How else do you wash in the field?
But in all seriousness, say for morning routine. I boil my water, pour some off into a mess tin to shave with, some into my muesli to rehydrate it and the last I use for a brew. There's a fair bit of water there. When we get issued with Hexi it is one box or four tabs per ration pack/day.
I far prefer to use something like this
Kiwi Camping Micra Gas Stove R&R Sport NZ
Turned up full tilt they will run for ~1 hour from a standard sized gas canister. It's quicker, you can cook right off the flame and as Toby mentioned with the smaller cans, that still provide 30m cooking time, it's a very compact unit.
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