Can some one tell me what kind of water purilyer I can get that works well. The kind where you fill it ina stream screw the lid on an let the filter do the work. No pumd jobs. I have looked at Katadyn Ultralight series or Aquamira's. What do I need to look for an what size micro filter should I have.Is 99.9% pure good enough to stop the bad stuff or a 1 micron filter or a 5 micron. Which one?