© Stockbyte/Thinkstock What is the fountain of youth? Exactly what it suggests. Being just 2 percent underhydrated can make you act and feel older. For a sharp mind, smooth skin, better health, and fluid movement, you need water. But forget about the old eight-times-eight rule (eight 8-ounce glasses of water daily). Healthy people, it turns out, get all the water they need from what they eat and drink (that includes tea and coffee but not alcoholic beverages). Thirst, though, should be your guide. If you’ve worked up a sweat exercising, are in a hot climate, or are taking medications, you may need to drink more than usual.
