Water is an important component of life. Allah has created every moving (living) creature from water (Surah 24, An-Nur, Ayet 45). We need about 15 glasses of water daily and human body contains about 60% of water. Without food we can survive for nearly 80 days, but only a few days without water. Fresh water for human and agriculture use is only 0.008 % on the earth. A shortage of fresh water is probably going to be most serious resource problem the world will face after a few years from now.