Coghlan's Emergency Drinking Water Germicidal Tablets are a must have item for ant first aid or emergency survival kit. When used as directed, these tablets disinfect drinking water making it safe for human consumption. Not to be used on a continuous basis, these tablets are meant for short term or limited emergency use only. With 50 total tablets, you can bring these for a weekend away or extended trip. Two of these germicidal tablets will disinfect approximately 1 quart of water. The whole bottle can treat up to 25 quarts total. Coghlan's is the leader in Outdoor Accessories, offering over 500 products for camping, RV'ing & much more!