It's tough, but definitely possible. The idea of desalinating seawater to make it suitable for human consumption dates back so far that Aristotle even wrote on the topic. Typically, heated seawater is put into tanks under low pressure, and as the water boils, the vapors are condensed into fresh water. Other ways to desalinate water include filtering the salt water through membranes or using electricity to filter out the salts (electrodialysis).
While scientists have the process down, there are... READ ON