One of the biggest issues for many people if SHTF is going to be finding and maintaining a consistent, safe water supply. Though our planet is covered in water, only one half of 1 percent is drinkable! For example, people who live in coastal regions are surrounded by water but it does them no good because one of the quickest ways to die of dehydration is to drink salt water.
There are ways to make that water potable, though, and science is finding even more ways. In order to turn salt water into drinking water, you need to desalinate it first. That just means that you need to remove the salt. There are many methods for doing this but the most efficient and realistic way to do it at home in a survival situation is by using the distillation by evaporation method.
Distillation by Evaporation
One of the easiest ways to convert salt water to drinking water is by using heat. You simply heat the water until it turns to steam, then capture the steam.
The water will evaporate but the salt and other impurities won’t. The problem here is that it requires a ridiculous amount of energy in the form of heat to get the job done. Still, it’s effective and if you combine the process with others, such as cooking or heating, you won’t be wasting nearly so much fuel.
Evaporation Distillation Method 1