The Fremen stillsuit in the movie Dune is a suit that can filter sweat into drinkable water. NASA may be one step closer to making this suit a reality but for astronauts aboard the International Space Station (ISS). Recently they have successfully recycled the urine and sweat of astronauts into drinkable water.
Up to 98% of ISS astronauts' urine and sweat can be processed by this new system compared to up to 94% using the previous system. The Environmental Control and Life Support System (ECLSS) recycles water vapor from astronaut sweat and breathing.
Meanwhile, the Urine Processor Assembly (UPA) system recycles urine and other waste materials using a vacuum filtration system. After filtering, there is still some residual brine which is then processed using the Brine Processor Assembly (BPA) which extracts more water to be recycled.
The water is then monitored to ensure its quality. If not it goes through the filtering process again. According to NASA the water cleanliness standards on the ISS are stricter than those used by various municipalities in the U.S.
This success allows future space missions to be facilitated. Who knows one day this system could be integrated into a space suit for astronauts to roam the planets or the moon without worrying about supplies. The latest suit is the Axiom Extravehicular Mobility Unit (AxEMU) designed by the designers of the For All Mankind series of suits.