Fancy a beer brewed from recycled wastewater in the basement of a San Francisco apartment building? That's the latest find from a start-up to demonstrate how water from showers, sinks and washing machines can be efficiently treated and returned to the building's 40 floors. The beverage was brewed to raise public awareness of the "untapped" potential of water sources that might seem unsavory at first glance, at a time when the American West is struggling with chronic drought exacerbated by global warming, explains Aaron Tartakovsky. IMAGES AND SOUNDBITES