If you have the space/conditions/money, a trout pond on a country lot makes a great water solution. Trout are incredibly suceptible to toxins, so they have a canary effect, warning you if your supply is bad, they do well over winter, and the trout double as emergency food. Also, if you pellet feed them, they become 'trained' and a pellet like lure will work every time when the emergency hits. Get a MSR Miox purifier, and you're set.