Ensuring the accessibility of water on Earth is a priority for science in the coming years to be certain.

But so is making sure it’s available in space.

It isn’t like finding water in space is impossible. The chemical elements that make water – hydrogen and oxygen – are abundant in space.

“NASA science activities have provided a wave of amazing findings related to water in recent years that inspire us to continue investigating our origins and the fascinating possibilities for other worlds, and life, in the universe,” says Ellen Stofan, a chief NASA scientist, on NASA.gov.

NASA astronaut and Expedition 65 Flight Engineer Mark Vande Hei services components on an advanced new toilet installed inside the International Space Station’s Tranquility module. CREDIT: NASA

NASA points to the four giant planets in our solar system – Uranus, Jupiter, Saturn and Neptune – as being likely to contain large amounts of water. There is also evidence that five moons of Jupiter and Saturn contain oceans under their surfaces.

In 2020, NASA announced the discovery of H2O in sunlit areas of the Earth’s moon, suggesting that the water molecule is widely distributed across the lunar surface.

And scientists have discovered a huge cloud of water vapor about 30 billion miles away that contains at least 140 trillion times the amount of water in all of the seas and oceans on Earth.

In fact, all of the water here came from out there as ice piggybacking on the comets and asteroids that plowed into a hot and dry young Earth. That’s right: Water is alien.

We recycle about 90 percent of all water-based liquids on the space station, including urine and sweat.”

– Jessica Meir , astronaur

For privacy, the toilet is located inside of a stall just like in a public restroom on Earth. CREDIT: NASA

But ensuring a steady supply for humans venturing out into space is a bit more complicated right now than steering into a vapor cloud or drilling into a frozen moon. Explorers will have to ensure they bring and manage whatever they need.

“We recycle about 90 percent of all water-based liquids on the space station, including urine and sweat,” says astronaut Jessica Meir on NASA.gov. “What we try to do aboard the space station is mimic elements of Earth’s natural water cycle to reclaim water from the air. And when it comes to our urine on (the International Space Station), today’s coffee is tomorrow’s coffee!”

Part of the liquid-recovery process is accomplished with NASA’s new space toilet: The $23 million Universal Waste Management System launched to the ISS in 2020.

The toilet, designed for male and female astronauts, aids in recycling more urine for tomorrow’s coffee. The water in fecal content is not currently being recycled, but NASA scientists are looking into it.

That could help them do better than their current 90 percent recovery rate. NASA wants to bring that recycling rate to 98 percent before humans board a proposed Mars transport vehicle for missions expected to last two years round-trip. NASA is aiming for the Mars missions to begin in the 2030s.