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How Long Can You Survive Without Water

how long can you survive without water

Water is crucial to a human’s survival. There’s been multiple stories about a person stranded somewhere that somehow survived without water for over a week, but it’s almost impossible. There’s a lot of factors that go into how long one can survive without water.

Survival Time

Water makes up 60% of a person’s body weight. The maximum time an individual can survive without water is about a week. You can’t survive without water. This is an estimate based on observations of people at the end of their lives. This is when food and water is stopped being given to the person in a dying state. One week is a long estimate. The typical time would usually be about three to four days. Experts say you can go about 100 hours without drinking when it is an average temperature outside. If it’s cooler, you can go a little longer. If exposed to hot sunlight, the time is shorter. There is no magical amount of days that states when dehydration cuts survival. It depends on the person and the temperature.

Water Sources

It’s crucial for your body to get the water that it needs to sustain the body. You can get some of your water from food, but that H20 is your best source. It’s important to drink an adequate amount of water at your home. Use a filter like a Berkey Water Filter to rid of any bacteria and chemicals that might be in the water. Some people say they just get tired of water. In this case, add natural flavors to your filtered water for a boost of taste. You can also drink juice and milk for hydration. Stay away from alcoholic beverages when you’re feeling dehydrated as they cause the body to lose more liquid through urination.

How long can you survive without water?

Natural Loss Of Water

Food and water are essential to our survival. A person can live a lot longer without food than water. Why? This is because so much of our body is made of water. We lose that water rapidly each day. On a daily basis, humans lose about two to three liters of water through bowel movements, urine, normal breathing, sweat, and home exercise. The amount of water you need a day depends on different factors. Things like your age, body fat, gender, health, and geographic location play into this. Women need about 2 to 2.7 liters while men need about 2.5 and 3.7 liters a day. If we don’t drink enough water, and we’re losing it on a normal basis, our bodies go into a fighting mode.


If you lose as little as three percent of your 60% of body water, you might feel dehydrated. This can lead to serious medical issues. When a person cannot get any water, their body starts to send signals. The brain tries to tell the body to conserve as much water as possible and to urinate less. The kidneys then slow down. Toxins begin to build up in the body. Once this toxic buildup hurts the kidneys, they cannot remove toxins adequately from the body. When the kidneys fail, these toxins continue to build. This may cause widespread organ failure.

Hydration will heal these effects. If you cannot get hydrated, your body will deteriorate quickly. Depending on a person’s exertion levels, they may feel a change within a few hours. If the person is vomiting or has diarrhea, their body will lose water faster. This is because that percentage of water in our bodies keeps it functioning. It acts as a lubricant in all of our joints, regulates our body temperature, and flushes away toxins. If your blood is not circulating correctly due to a loss of water, your blood pressure may crash. It only takes 10% of body weight loss to be considered an emergency.

Thirst might not be something you think about until you’re craving a big glass of water. Your body relies on that water to help it function. Without water, your body will die. You might be able to survive a few weeks without food, but water is crucial to every part of your being. Next time you’re thirsty, grab a large glass of water and be thankful that you’re maintaining your health.

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susan stroschein

Susan Stroschein

Content Creator

Susan Stroschein was born and bred into a lifestyle of preparation. From her childhood with parents who survived the great depression to serving in the Air Force where preparation and readiness was crucial to living.  She spent 23 years in Central Florida where she furthered her understanding of what its like to be without basic essentials after a natural disasters. Stroschein has a heart for the people and knew that starting a business to help others be prepared in tough situations was essential to the future of those around her.

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