Comets and Jupiter/Saturn ring chunks would be much easier.
If you don't mind a bit of mining & processing, some types of asteroids have significant volatile components, as well. But then, so does the moon.
Space/Science » in reply to Will it be that hard to bring iceteroids in from the Kuiper belt, etc.?
If you don't mind a bit of mining & processing, some types of asteroids have significant volatile components, as well. But then, so does the moon.