Human
In general, humans can survive for two to eight weeks without food, depending on stored body fat. Survival without water is usually limited to three or four days. About 36 million humans die every year from causes directly or indirectly related to starvation. Childhood malnutrition is also common and contributes to the global burden of disease. However global food distribution is not even, and obesity among some human populations has increased rapidly, leading to health complications and increased mortality in some developed, and a few developing countries. Worldwide over one billion people are obese, while in the United States 35% of people are obese, leading to this being described as an "obesity epidemic." Obesity is caused by consuming more calories than are expended, so excessive weight gain is usually caused by an energy-dense diet.
Bottled water
Bottled water is often stored as part of an emergency kit in case of natural disaster. The U.S. Federal Emergency Management Agency (FEMA) says the "safest" and "most reliable" source of drinking water is store bought bottled water. Commonly, disaster management experts recommend storing of water per person, per day for at least three days. This amount is intended to include water for drinking and cooking as well as water for hand washing, washing dishes, and personal hygiene. Factory-containers of water have an indefinite shelf life, as long as they remain unopened and undamaged. The sell-by date is voluntarily and individually set by manufacturers to indicate the length of time that they believe the water will taste and smell fresh, rather than to indicate any issue of contamination or food safety.