For what it is worth, water is abundant in the solar system. That won't be a problem if we ever get started.
I'm aware of water's abundance, But I bring to mind the lack thereof on the moon specifically (that too may have been proven not to be the case, incidentally). I saw that bemoaned more than once as the main impediment to development on the moon. Water weighs roughly 6 or 7 pounds to a gallon, and lugging enough along to the moon to sustain even modest operations would break the bank.(or so it was before water was supposedly spied in some of the moon's polar craters). Other places in the solar system are another story, as you suggested.