We'll probably (50% or greater chance) want all the water we can get our hands on. Water makes great rocket fuel and is a critical component of life support systems. Water, having mass, tends to collect in gravity wells.
I am making the assumption that we will have a much stronger preference for water closer to Earth, and we aren't talking about large gravity wells.
[0] https://en.wikipedia.org/wiki/File:PIA17046_-_Voyager_1_Goes...