Sales of traditional soft drinks (sodas? pops?) haven't exactly been effervescent of late, so beverage giants PepsiCo (NYSE: PEP) and Coca-Cola (NYSE: KO) have recently ramped up their efforts on non-carbonated drinks. Today, Pepsi introduced a low-calorie version of its Gatorade Sports Drink, called "G2."

While the original Gatorade has always been marketed as an electrolyte-rich drink to gulp down during or after workouts, G2 - with 25 calories per eight-ounce serving - is designed to keep calorie-conscious folks hydrated even while they're at rest. G2 will initially come in three flavors - fruit punch, grape, and orange, and a single bottle is expected to run between $1.29 and $1.49.

Pepsi also said it will launch a new addition to its Propel line of "Fitness Water." "Propel Invigorating Water," a vitamin-enhanced offering, will include a mild shot of caffeine and a subtle flavor, totaling 20 calories in each eight-ounce service. The new Propel will come in strawberry, citrus, and berry flavors, and cost 99 cents to $1.59 per bottle.

Pepsi shares are trending modestly lower today, following the example of the downward-spiraling broader market, but the soft-drink firm's long-term trend is an attractive one. Pepsi has been on the rise since early 2003, nearly doubling in value as it hugs the support of its 10-month and 20-month moving averages. If Pepsi continues to pace the trend for "healthier" non-alcoholic beverage offerings, this trend could remain the stock's friend for the foreseeable future.

Beth Gaston Moon is an analyst at Schaeffer's Investment Research.