Instead of plastic bottled water, it's cheaper to drink tap water. But how do you know if the water from whatever tap you are using is safe? If you don't have a water testing kit, try this simple test. First, fill a clear glass with water from the tap. Hold it up to a bright light or the sun, and see if it's cloudy or clear. It should be clear. If there's anything settling at the bottom of the glass or things floating, that could mean there is dirt, metals or bacteria in the water. Now smell it: If it has a foul odor, that's a sign to avoid it. While it may just be safe chlorine or sulfur, it's better to skip it.