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Even when you use purifying tablets, water from a swamp or other water sources may still not taste good or smell dingy. A way to help this is charcoal. A little bit of charcoal will make water taste better, and take away the bad smell. Pack the crushed charcoal into the container TIGHTLY. The idea here is to create as fine a matrix as possible for the water to DRIP through slowly, thus trapping more sediment or impurities. If the water runs rather than drips through the filter, you will need to pack your charcoal tighter.