Water is life sustaining and particularly so in a survival setting, where your exertions mixed with the stress of the situation will push you to exceed your normal demands for staying hydrated.
Survival is hard work and that means you become dehydrated quicker, particularly if you are in a warm environment; but even in a cold environment, dehydration is acuter when you are doing all you can to stay alive!
Fortunately, in most places, water sources are abundant – but pure water is not.
Which means unless you want to risk getting sick, you have to have a method of purifying water.
The video on the next page covers several ways of finding water and then purifying it to make sure you have the liquid you need to stay healthy!