Ok, so I'm a little sketchy on where I heard it originally, bu I think I was watching some sort of space show that said that hydrogen and oxygen mix together to propel a rocket but they capture some of the emitted water vapor and turn it back into water for other uses. I can't find specific reference to this recycling on the internet, but liquid hydrogen is a commonly used rocket propellant.
Not tons, but some, in support of work for a prior employer.
But it turns out one of the ordinary byproducts of ordinary rockets is water, which is why all space food is dehydrated.
More like 'a particular fuel that can be used in a rocket is ..'
But actually I'm not sure what you're talking about, sorry. Can you expand and correct my knowledge?
Rocket fuel goes out the back end, pushes the rocket forward, right? The water is stored in tanks which astronauts draw out to rehydrate their tang?