“Enhanced water” is gaining popularity and is helping companies such as Coca-Cola and Pepsi to turn a tidy profit. Many of these trendy drinks contain an array of ingredients and claim a variety of health benefits. Newsweek and the Center for Science in the Public Interest, an advocacy group that focuses on nutrition, say that the science behind many of these health claims is weak. They have assembled a small list of four “enhanced water” drinks which are probably doing little more than keeping you hydrated.