If people without an access to clean water want it, the proper route is to trade with those who do, not victimize them. There can be no right that involves sacrifices of one man to another.
Trying to wield sacrifices at the point of a gun (by an official or legislator) is the most important and disturbing modern issue. It paves the road to all actual social conflicts, unrest, and misunderstanding.
The people withholding the water in this scenario are the ones victimizing the ones without. That's where the state monopoly on violence has to come in as a corrective mechanism.