How to make an effective charcoal and sand water filter using two buckets. Great for purifying even the dirtiest water. Relatively easy to make with the step by step instructions given in this video. In a survivalist situation having clean water can’t be taken for granted. One of these will ensure you have the ability to make rain water, stream water or even puddle water safe, Note if you use dirty water PLEASE boil it after passing it through this filter!