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How much water you should drink depends on three main factors: climate, your level of exertion and your own individual needs. 1  Climate: When hiking in hot and/or humid conditions, one litre per hour is generally recommended. Climate: When hiking in hot and/or humid conditions, one litre per hour is generally recommended. 2  Same goes for altitude, where although the temperature may be cooler, the air is drier and thinner. 3  In milder conditions at lower altitudes, half of the above mentioned quantity should normally suffice.
  Answer   the national average water usage per person is around 200 gallons per day.(Shower/tub, Sink,Toilet,washing clothes,washing dishes,cooking,miscellaneous.).