That should get you by but pollution is an issue. Unless there is a natural spring on your property, I wouldn't like the idea of drinking from a river everyday unless it was distilled. Sure you can kill parasites, and bacteria but what chemicals are in it. Of course, I don't trust tap water either. That's the thing I probably worry too much about. In a survival situation I'll do what I have to do to stay alive. There are creeks nearby but it's far enough that it would be very cumbersome for me to haul everyday. I'd probably do it occasionally for appearances though. From what I read about Bosnia if things are bad enough going out for any reason could get you killed. I'd just rather have what I need in my home already. Too bad I don't have a well but even the ground water they say its getting polluted.