Over the past few years, an increasing number of consumers have reached for a bottle of Vitaminwater after a workout. The sports drink has emerged as a serious competitor to Gatorade and other noncarbonated beverages, so much so that Coca-Cola forked over $4.2 billion in cash to buy the brand from Glaceau back in 2007. On its July 21 earnings call, Coke CEO Muhtar Kent was particularly bullish about Vitaminwater, which is now being sold in 15 markets worldwide, including France, China and Sou...