This would make an awesome premise for a sci-fi book. A plot along the lines of "Humanity must stop This Bad Thing but to do so they need Lots of Water but they have used up all the water so they have to Pull Together in Time of Crisis in order to retrieve all the water while contending with the fact that the water is around a black hole." Maybe throw in some serendipitously discovered alien technology that makes it all possible.

I think that it would make for a truly epic space opera if written by the right author.