W is for Water In Space

Water: Without it, we die. Real fast. So if we are to colonize the moon, Mars, asteroids, and beyond then we need to find ample sources of water. We as space travelers simply cannot lug it into space with us. 
We have to ask: How much water is in space? Where is it? Can we find and extract it at a cost that makes sense? And if there is water (in ice, vapor, or liquid form), will there also be life? 
Water forms when two hydrogen atoms and one oxygen atom get together. So theoretically...