Making an Island/Facilities/Water

Desalination of Sea Water
Sea water can be processed to remove any dissolved salts to provide almost pure water. The simplest technique for doing this is simply to heat the water until it evaporates and then re-condense the water into a fresh water tank. As a by-product of this you will have a large quantity of salt. If you break the process into separate stages you can sort these separate salts as they will come out of solution at different points. However, since distilled water has no minerals, you should consider adding 2-4 drops of sea water, which contains the minerals that the body needs to survive. Drinking distilled water is unhealthy and could eventually kill you.

Desert Cone
Basically you make a hole and then put something to collect water in the bottom, then you cover it with a waterproof tarp and put a rock on the place above the container. then condensation will drip down into the container.

Distilling Water
You can distill water without using any fuels by using a solar oven or cooker