Two-part kit is convenient and easy to use Safe and T.S.A. legal for air travel Mix to create fresh water treatment solution on demand Fast: Only 30 seconds to activate for use Safety dropper tops = no spillage Flight ready, T.S.A legal Water Purification Drops. Kit includes 2 oz. Part 1 and 2 oz. Part 2, perfect for water purification on the go whether you are catching a flight or charting a path through the rugged wilderness, having Travel Pack Water Purification Drops on hand, means you are ready to go without having to worry about safe drinking water. Part 1 is Sodium Chlorite 28% and distilled water. Part 2 activator is 50/50% food grade citric acid and distilled water. When they are mixed together and allowed to activate for 30 seconds, the result is chlorine dioxide water treatment solution. Add to available drinking water to make sure you are protected. Campers, hikers, and explorers of all kinds use Travel Pack Water Purification Drops to purify even the most questionable standing water safe to drink. Murky water requires more time to process following adding water to the water treatment solution (the less transparent the more time is required) 5 minutes to 30 minutes depending on the visual condition of the standing water. Travel Pack Water Purification Drops come with safety flip top dropper tops, not eye droppers. Less risk of spillage or deterioration of eye dropper squeeze bulbs.