Survival skills
A human being can survive an average of three to five days without the intake of water. The issues presented by the need for water dictate that unnecessary water loss by perspiration be avoided in survival situations. The need for water increases with exercise.
LifeStraw
The LifeStraw is a water filter designed to be used by one person to filter water for drinking. It filters a maximum of 4000 litres of water, enough for one person for three years. It removes almost all of waterborne bacteria and parasites. In addition to the classic LifeStraw, the manufacturer also produces other styles on the LifeStraw product: the LifeStraw Family, a larger unit designed for family use, and the LifeStraw Go Water Bottle, which incorporates a LifeStraw filter into a plastic sports water bottle.