One of the easiest ways to save energy flows straight from the tap. The United States has some of the safest drinking water in the world, yet many Americans choose bottled water. These bottles require enormous amounts of energy to manufacture and recycle, and many end up cluttering landfills. If you don't like the flavor of your tap water (or you're concerned about pollutants) consider purchasing a water filter, such as PUR, which uses an activated carbon microfilter to provide clean, great-tasting water. You can drink to that!