DR. SHRINIWAS KASHALIKAR DRINKING WATER The water is so much important for the body but what alas; its importance is hardly described in textbooks of physiology or even preventive or curative medicine. Out of this about 66 % i.e. about 28 liters is in the cells called intracellular fluid and about 34 % i.e. about 14 liters is outside the cells called extra cellular fluid.