[ applause ] ♪ welcome back to cnn heroes. water scarcity is a growing global crisis. nearly a billion people live in areas without access to water. our next hero has designed a game-changing water system for his people in india. sharon stone. >> when you grow up in one of the driest regions on earth, you learn at a young age that water is precious. this is the truth that bogwati learned as a young boy in the village located near the tar