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Water-propelled Satellite

Exploration team shoots for the moon with water-propelled satellite

Cislunar Explorers, a team of Cornell University students guided by Mason Peck, a former senior official at NASA and associate professor of mechanical and aerospace engineering, is attempting to boldly go where no CubeSat team has gone before: around the moon. Not only is Peck's group attempting to make a first-ever moon orbit with a satellite no bigger than a cereal box, made entirely with off-the-shelf materials, it's doing so with propellant that you can obtain simply by turning on a faucet. Ref. Source 8c.

Satellite Water-propelled

Interesting, but isn't that a heavy fuel source or maybe they intend to absorb it from the atmosphere of the earth before it goes to the moon? Can't quite think how that would work.