Good choice! For many years, NASA has produced water by combining hydrogen and oxygen in a fuel cell, using a process called electrolysis. Fuel cells not only produce drinking water, they also produce electricity, so they are very valuable on a space station.

But to make water this way, you have to bring oxygen and hydrogen into space. There's an easier way—what is it?

Capture passing comets for their water

Recycle your urine

© The Children's Museum of Indianapolis, 1999