Chipotle Mexican Grill Inc. is testing some changes to its beverage program, including a new mezcal-spiked margarita, organic sangria and high-fructose-corn-syrup-free Coke Life as a fountain drink, according to a report Thursday. Westword interviewed master sommelier Richard Betts, who is working with Chipotle to rework the beverage program at one unit in the chain’s home market of Denver.