Practically speaking, is it currently feasible to scrape together several tons of lunar topsoil and process enough water out so that one person can stay hydrated for one day? It costs something like 10,000 USD to get one pound into orbit, so what would processing tons of lunar soil cost? Would the cost of sending the processing equipment to the Moon cost more than just sending the water? I suppose that a lot of the process could be automated and use free solar energy to run things, but its not like the water is going to just come to you. Some areas may have no water and the area around a permanent lunar base would eventually be depleted. How much water could we get from mass-driving an icy comet into NEO and what would that cost? Have we found useful water on the Moon?