Two of the new bubbly drinks from Starbucks. Starbucks Starbuck is testing new carbonated versions of its popular refresher drinks in select markets. Non-coffee drinks are playing a key role in Starbucks growth, especially among younger customers. The company said its refreshers line is delivering double-digit year-over-year growth. Starbucks CEO Brian Niccol is ready for some fizz. The company is testing a carbonated version of its Refreshers, which are iced juice and tea drinks often mixe...