While I maintain a large potable water supply (185 days+) it will eventually have to be replaced and my plans for that are two fold. (#1), I live in close proximately (less than 1 mile) to two large natural springs and several spring fed streams that run year long even during summer droughts. (#2), I plan on utilizing the 420 gals of water I maintain year around into gray water and also for plant/crop irrigation purposes. I will resupply this source via rain water run off and have the equipment on hand to make that conversion. Now, here is the sticky part. Eventually no matter where my water source comes from after 185 days of so I will to have a method to filter my drinking water and want a reliable filter to do this. I prefer that it be a portable system and don't want to spend a ton of bucks on it. Hell I guess maybe I want to adopt one!! I want to see what you guys and gals have used and recommend.