While reaching for a cold beer or an iced coffee may sound like a refreshing idea, both alcohol and caffeine are diuretics, meaning they actually dehydrate the body. Sodas and other sugar-laced drinks add calories as well. So instead, opt for natural juices, seltzers, decaffeinated herbal tea, or, even better, turn to the water faucet. If you're hot, drink cold water to help cool the body down. Snazzy sports drinks are a popular option for some athletes, and non-athletes as well.
Grant explains that in terms of rehydration, they are about as effective as water.