Kishu Charcoal - Activated Charcoal Water Filter for Water Bottles Kishu To Go for water bottles is the simple, elegant way to filter tap water. Simply place in any water bottle, add tap water and watch Kishu go to work. Kishu bonds with toxins and imparts good-for-you minerals One stick can be used for 4 months Kishu can be reused as a deodorizer or broken up and placed in the garden as bio-char