Good thinking little inventor, I think the Washanator would work brilliantly in space. Have you seen how the astronauts currently wash their hands? It's fascinating but a little messy and awkward as the special soapy water pouch floats around, you have to be quick to catch the water! Containing the water in a box is a great idea, you could even upscale it so the astronauts could have a shower. Well done Hudson.