In a temperate climate, a person loses 1.5 liters of water every 24 hours through sweating, breathing, and urination. Physical exertion and high heat can increase that loss to as much as 1 liter per hour. The minimum level of necessary water replacement depends on the air temperature and your activity level. If your resting at 80° F, you will need to consume a minimum of 1 liter every 24 hours to stay alive. If your water supplies are limited, you need to stay in the shade and avoid exertion.
– www.neodata.com/pub/bpkz/SurvivalSkills.pdf
Stay hydrated, not thirsty!
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