Just use chlorine dioxide tablets from Katadyn. Wait 1-2 hours in cold temps, 1/2 hour at summer temps. It kills ALL pathogens and doesn't impart a bad taste, unlike bleach chlorine and iodine.

But, I confess, I boil untreated water for 30 seconds and then use the water for freezer bag cooking, etc. Never got sick... yet.

Eric
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"There are no comfortable backpacks. Some are just less uncomfortable than others."