We use it day in and day out in our homes, but how much do we really know about water? Are we really running out? Kevin O’Connor speaks with author Charles Fishman (“The Big Thirst”), uncovering surprising facts about all things water. Las Vegas and Orlando show us who’s boss in the water conservation game, and This Old House plumber Richard Trethewey solves a water mystery. Water is too cheap and it’s the ultimate recyclable in need of a revolution.