I have lived in Inuvik for the past 28 years, and done a lot of travelling, hiking, float plane flying, cycling, biking, etc. I have never used any water purification systems in my life, and do not know of anyone that uses them. All the water is clean. Usually the biggest problem is that you do not have any water in some areas. Also you only have to carry emergency food unless you out in the bush somewhere. If you are on the road system, you can always purchase food at the end of the day.
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