The Centers for Disease Control and Prevention reports that, although there are recommended daily amounts for water intake, more water is necessary in certain conditions. People living in hotter climates, who are physically active, or who are sick with a fever or diarrhea require more water to replenish bodily fluids and prevent dehydration.
Water accounts for about 60 percent of a person’s body weight and is involved in every bodily function, according to the Mayo Clinic. It flushes toxins out of organs, provides a moist environment for soft tissues such as the nose and throat, and transports nutrients between cells.
The body loses water through sweat, urine and bowel movements. The Mayo Clinic states that without enough water each day, the body becomes dehydrated. Base daily water intake on activity level or other circumstances that cause water loss. With exercise or an illness with fever, it is advisable to drink more. However, certain illnesses such as heart failure require limiting water intake
The Institute of Medicine recommends that men drink 3000 ml of water each day and women drink 2100 ml. This equals approximately 13 cups of liquid for men and 9 cups from women. An individual often requires more water to stay hydrated in hot weather or due to strenuous exercise.