It has long been speculated that the moon could have, and most probably did have, water ice deep underground or in the polar regions, inside of deep craters, where the sun does not shine thus evaporating it. This speculation was based on the assumption that comets, partly made up of water, would hit the moon and leave a remnant of its mass in those protective regions. In my opinion, it was a certain bet that they would make this discovery and they did.
Other than being convenient for moon colonies, every pound of supplies from earth costing hundreds of dollars per pound, this water could, if there's enough of it, be used to terraform(transform into earthlike planet) the moon. I believe that it's possible that there is frozen carbon dioxide("dry" ice) and a combination of that and water ice could be used to support life on the moon. You would be short on some elements but they could be gathered from Asteroids.