Water has always been an important and life-sustaining drink to humans and is essential to the survival of all organisms. Excluding , water composes approximately 70% of the by mass. It is a crucial component of processes and serves as a for many bodily . The in risk assessment calculations assumes that the average American adult ingests 2.0litres per day. Drinking Water Sydney of a variety of qualities is bottled. is sold for public consumption throughout the world.