Survival skills
A human being can survive an average of three to five days without the intake of water. The issues presented by the need for water dictate that unnecessary water loss by perspiration be avoided in survival situations. The need for water increases with exercise.
Standard of living in India
A 2007 study by the Asian Development Bank showed that in 20 cities the average duration of water supply was only 4.3 hours per day. No city had a continuous water supply. The longest duration of supply was 12 hours per day in Chandigarh, and the lowest was 0.3 hours per day in Rajkot.