Oh wait, you are serious aren't you? You should understand that the planet does not care one way or the other if you die from lack of water or by contaminated water. Out in nature, away from the comfort of a government to wipe your ass, clean water is your own responsibility. Failure can result in rapid weight loss or even death. There is nothing that says these people, who live in an area where this has happened before can not provide themselves a store of safe water.