Desalination is a skill some survivalists don't think about often, but should know in the back of their mind. Salt water is not something that you can drink. If you were ever in a situation where the only water you had access to was salt water, you need to know how to do this.
Saline is water with a heavy concentration of dissolved salt particles. The more salt content water has, the higher concentration it has.
United States Geological Survey's Water Science School shares some valuable information on the science behind desalination.
It also offers a useful trick to help you remove the salt from the water. You can find out more about it on the next page.