The 20-somethings who have graduated to Gatorade and bottled water also drink Muscle Milk after a workout and snack on Greek yogurt.

FORBES: How the Milk Industry Went Sour, and What Every Business Can Learn From It

If necessary, drink beverages after meals and stick with juice and milk instead of water as much as possible to increase calorie intake.

CNN: How can I help my heroin-addicted daughter gain weight?

The new soft drink-like packaging helped fast-track bottled water's growth past milk and beer.

WSJ: America's new love: Water