It is better to drink water not less than 2 liters every day. Because as a universal solvent, water has many roles in our body. Some of them are: a) Water can act as a buffer that can maintain the osmolarity and pH of the blood. b) Water is the base for all metabolic reactions. So it is important for the proper distribution of nutrients all over the body. c) Drinking plenty of water can reduce the risk of kidney diseases. Because it can facilitate proper filtration of waste from the blood. d) Drinking plenty of water can decrease fatigue. e) Drinking more water can reduce the dehydration of the body. f) Water can detoxify the blood to some extent.