How to turn salt water to fresh water?

Answer 1

One way to do that for relatively small volumes of water is to force the sea water through a special membrane filter under high pressure. The filter membrane must be constructed so that its holes are large enough to just pass a water molecule, but not large enough to pass metal
molecules, salt molecules, algae, etc. The result would be fresh clean water with a lot of brine solution left in the pressurized tank that needs to be dumped.

Another process which is more poractical for large volumes of fresh water production is electrolisis. In that process, electrical current is passed through the water to break it down into its basic elements such as hydrogen and oxygen (and all the other junk that is left over).

Once the hydrogen and oxygen are collected and recombined, the result is pure fresh water. Again, the vat or tank holding the original sea water now has a heavy brine solution which must be disposed of somehow. Most any use of sea water to produce fresh water will generate a lot of salty brine by-product that could poison sweet earth in the vicinity if it is merely dumped.

Answer 2

Boil the water, capture the steam in some seperate container.

The salt won't evaporate with the water, so it will be left in the original container, and when the steam cools down you will have fresh water.

Answer 3

take one bucket of salt water to a shop. hand over bucket of salt water and some money and ask the magic person behind the counter for some bottle water. he/she will then swap said bucket of waer and money with a bottle of nice desalinated water for you. thank them kindly and the leave.
well done

Answer 4

electrolisis , evaporation. or membrane osmosis

Answer 5

distillation. that's what this guy described to you.