[userulluipeste]

Besides what tdy721 and monk_e_boy said, water would be tricky to be had in our near-space neighborhood for two reasons. First, Earth, being a real planet, cleaned its surroundings of most of free-roaming objects. Besides the (domesticated) moon, there aren't that many wild objects around to look for. Second, water has a relatively low boiling point and on the Earth's distance from the Sun there is a lot of solar energy to melt the asteroid ice and boil away (like what we see happening on comets) before we can extract it, and then having difficulties with its handling after we have it due to very same reason.