Everyone living in a coastal area should learn this skill. If you run out of drinking water and there’s a drought or you have no access to lakes or rivers, you might have to gather water from the ocean.
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The cruel irony of planet Earth is that there is water almost everywhere, but less than one percent of it is safe to drink. Not only will drinking salt water make you even more dehydrated, enough of it will cause kidney failure and death. But knowing how to turn saltwater into drinking water can get you around this problem.
The simplest way to do it is the distillation method. When saltwater evaporates, it leaves the salt behind. Then when the steam condensates on a surface, freshwater drips off of that surface into a container. To see what I mean, watch this video by Jenny from MomPrepares.
One solution is a solar water distiller. This method uses energy from the sun to heat up the water. It’s a very slow process so you would need to have a lot of these going (or a few very large ones) to get enough drinking water for the day, but it could work.