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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.
Per capita domestic water usage also varies greatly from state to state. Maine uses the least at only 54 gallons per person per day, while Nevada uses the most at 190 gallons per person per day. According to the 2005 USGS data, every Western state except for Alaska uses more than 100 gallons of water per person per day.