DayOne Response develops and supplies innovative solutions for disaster relief. One solution is the DayOne Waterbag, which is a lightweight reusable personal water treatment device that provides all the essential functions for water purification. According to co-founder Amy Cagle, DayOne Waterbags have been deployed in over 20 countries, and the company has provided over 7 million liters of clean water in less than a year.
https://thedailybanter.com/2015/06/22-of-the-most-fascinating-social-good-startups-changing-the-world/