How long before dehydration kills you?
Be advised that death due to dehydration can occur in 3 days (or less in hot weather) and no one normally lives more than about 5-6 days without water.
What happens when you go without water for 3 days?
After three to five days of not drinking water, your organs begin to shut down, especially the brain, which could have lethal consequences including fainting, strokes and in extreme cases, even death.
Can you go 40 days without water?
In general terms, the human body can go two to three days without water and, it is often said in survival guides, 30 to 40 days without food of any kind. (Many of these guides also discourage people from scavenging for wild plants or shrubs because of the adverse effects these can have.)
What is the longest someone has survived without water?
In a comfortable environment, however, an adult can last without water for a week or more. Andreas Mihavecz, an 18-year-old Austrian man, may have survived the longest without drinking water: Police accidentally left him in a holding cell for 18 days in 1979.