survival situations need water increases exercise ref name hub http healthhowstuffworkscom live without food water htm howstuffworks charles w bryant ref since human body composed water birth average surprise water higher list fire food although water intake varies greatly depending factors like age sex etc average cups liters many lost people perish due dehydration debilitating effects water born pathogens untreated water typical person lose minimally two maximally four liters
Applied science Human physical performance and recreation Survival skills