Fast-food chains are chasing the specialty drink boom. Inside Sonic's strategy

As restaurant chains increasingly turn to specialty beverages to attract customers beyond the traditional meal, Sonic Drive-In believes a business model built around drink customization gives it a head start.Marion Campbell, Sonic's vice president of integrated marketing and communications, told FOX Business that the quick-service restaurant industry is still figuring out how to make specialty beverages a bigger part of its business, while Sonic has spent years building customization into its op