Seawater contains salt. When humans drink seawater, their cells are thus taking in water and salt. While humans can safely ingest small amounts of salt, the salt content in seawater is much higher than what can be processed by the human body. The "simple" hurdle that must be overcome to turn seawater into fresh water is to remove the dissolved salt in seawater. That may seem as easy as just boiling some seawater in a pan, capturing the steam and condensing it back into water (distillation).
Here in this video, you can see the most effective primitive method of getting drinking fresh water from this amazing survival technology.  The good way to do this is to boil the water. When salty water boils only the pure water will turn into steam, but the salt will be left behind. The man has shown this way of getting pure drinkable water from salt water. You could do this with a test tube of sea water. Put a little sea water in the test tube and seal with a stopper, but use a stopper which has a hole in it to connect a length of tubing.

You can put the other end of the tubing loosely in another test tube.Now boil the water in the 1st test tube using a bunsen burner. The sea water will boil and turn into steam. Hot steam rises and will rush into the tubing. When we consume salt as part of our daily diets, we also drink liquids, which help to dilute the salt and keep it at a healthy level. Living cells do depend on sodium chloride (salt) to maintain the body’s chemical balances and reactions; however, too much sodium can be deadly.

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