Water is essential for staying alive. Of course, the amount of water required varies according to age and gender, and also where someone lives. Generally, an adult male needs about three litres per day while an adult female needs about 2.2 litres per day. Some of this water we get in our food.
Water serves a number of essential functions to keep us all going including: forming saliva and flushing body waste through digestion and urination, regulates body temperature, metabolizes the carbohydrates and proteins that our bodies use as food and transports them by water in the bloodstream, acts as a shock absorber for brain, spinal cord, and foetuses, lubricates joints, helps deliver oxygen all over the body, used by the brain to manufacture hormones and neurotransmitter.