Well, according to a New Scientist article , with at least a supply of vitamins and water, you can survive over a year without eating. However, with vitamins but no water, survival time is sharply reduced. "A human can be expected to survive for weeks without food, but a thirsty person deprived of water would last a matter of days. Without water, the volume of blood in your body drops, and with it your blood pressure. Blood becomes thicker and stickier, making it harder to pump around …