Do: Filter Your Tap Water

We hear it often, and it's true: Tap water in the United States is about as safe as it gets, by world standards. But even if U.S. cities are blessed with well-treated water free of bacteria, chlorination produces byproducts (chloramines and trihalomethanes) that may be unhealthy. And pharmaceuticals and some other contaminants may not be filtered out, even by modern water treatment plants. Finally, 15 million Americans rely on private well water that isn't tested for contamination. To find a water filter that's right for your needs, use the Environmental Working Group's handy water filter buying guide. Options range from the effective and relatively affordable Culligan RC-EZ-Change 4 for under $80) to the comprehensive but expensive.