Stay hydrated in zero gravity: Inside the daily struggles of astronauts’ water intake in space

When we think of astronauts, we often imagine them floating in space, conducting experiments or spacewalks, and living a life of adventure and discovery. However, as awe-inspiring as their work may be, it comes with many challenges, including something as basic as staying hydrated. In fact, daily water intake is a crucial aspect of an astronaut’s routine, and it presents unique challenges when living and working in space.

The Importance of Daily Water Intake

Water is essential for our bodies to function properly. It regulates our body temperature, aids in digestion, and helps flush out toxins. Without enough water, our bodies can become dehydrated, leading to various health issues such as headaches, dizziness, and fatigue.

Water Intake Challenges in Space

For astronauts living on the International Space Station (ISS), getting enough water can be a bit more challenging than on Earth. On Earth, our bodies rely on gravity to distribute fluids throughout our body. In space, without the pull of gravity, fluid tends to float around in our bodies, leading to a condition called “puffy face syndrome.” This can also make it difficult for the body to determine when it needs to drink more water, leading to dehydration if not monitored carefully.

How Astronauts Stay Hydrated in Space

Despite the challenges, astronauts must maintain a daily water intake of 2-3 liters while in space. To do this, they rely on several methods:

  • Recycled Water: On the ISS, urine, sweat, and other water sources are recycled using a complex process called the Water Recovery System. This allows astronauts to reuse up to 93% of their water, making it a vital source for maintaining daily water intake.
  • Dehydrated Food: Astronauts’ food is dehydrated and must be mixed with water before consumption. This not only saves valuable storage space on the ISS but also helps to increase water intake.
  • Water from Spacecrafts: When a new spacecraft arrives at the ISS, it brings along a supply of water. However, this must be rationed and used sparingly as it is not enough to last the entire mission.

Why Tracking Daily Water Intake is Crucial

For astronauts in space, it is crucial to track their daily water intake to ensure they are getting enough fluids. On Earth, we have a strong sensation of thirst to remind us to drink more water. In space, this sensation is often not as reliable. Plus, with the added stresses of spaceflight, it is even more challenging to remember to drink water regularly.

This is where the Daily water intake calculator can be incredibly helpful. It simplifies the process of tracking water intake, making it easy for astronauts to ensure they are getting enough fluids to stay healthy.


Q: How much water do astronauts need to drink in space?

A: Astronauts in space need to drink 2-3 liters of water per day to maintain healthy hydration levels.

Q: How do astronauts drink water in space?

A: Astronauts drink water from pouches using straws or squeeze bottles. They can also mix water with their food.

Q: Can astronauts drink water from the ISS’s water supply?

A: Yes, astronauts use a complex Water Recovery System to recycle their urine, sweat, and other water sources for consumption.

Q: What happens if an astronaut becomes dehydrated in space?

A: Dehydration can lead to various health issues and can even be life-threatening in extreme cases. That is why tracking daily water intake and staying hydrated is crucial for astronauts in space.


Being an astronaut is a dream shared by many. But as we have seen, even the most basic tasks, like staying hydrated, can present unique challenges in space. Fortunately, through advanced technology and careful monitoring, astronauts are able to maintain their daily water intake and continue their important work in space.

So, the next time you look up at the stars, remember the challenges that astronauts face, including the simple task of drinking enough water, and appreciate the incredible human achievement of space exploration.

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