Bloomberg: Virtually all of the water flushed down toilets and sent down drains in U.S. homes and businesses goes to wastewater treatment plants where it is cleaned up and then discharged into rivers, lakes, streams and oceans. Only a small percentage is directly reused. A conservation push spurred in part by drought, and expectations of greater shortages in the future, could change that. Soon, consumers could be irrigating their lawns or washing their cars with water that has come directly from a wastewater...