If your worried about your drinking water just add 5 drops of household bleach per gal of water.
My home sits on 1 1/2 acres at the end of a dead end private road. The property is surrounded by a 5 foot chain link fence with a gated driveway. I have a couple of dogs that have full run of the property, one of which is a 135 pound bull mastiff. The owner is well armed, knows his weapons well, and practices regularly.My kit contains a nearby river & a rifle