You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Physiological requirements for drinking water have been estimated at about ____litres per head per day. and explain in detail?
The basic physiological requirements for drinking water have been estimated at about 2 litres per head per day. This is just for survival. But from .the standpoint of public health and improvement of the quality of life, water should be provided in adequate volume. It will help to reduce the incidence of many water-related diseases among the people most at risk.