That is the state guaranteeing access to water. It isn't picking a guy out of the crowd, pointing a gun at his head, and telling him to work the well and give everyone else water. States usually reimburse private utility companies, or run them themselves.

The superposter means, I think, that you cannot have a right that deprives someone else of their freedom. If nobody wanted to work at the water treatment plant, the government is hard pressed to compel anyone to work there within any sane persons logic. They would have to offer higher pay until someone did the job, but they couldn't point a gun at someone and make them do it. Unless they were a prisoner, or maybe a soldier.