ATLANTA–(BUSINESS WIRE)–SONIC® Drive-In is casting a spell on taste buds nationwide this Halloween season with the launch of the Witch’s Brew Slush Float. A bewitching addition to the Flavorista Favorites premium drink lineup, this limited-time seasonal treat is a refreshing twist on the classic caramel apple treat. Witch’s Brew will be available at SONIC locations nationwide on September 30, but SONIC App users can score early access by placing an order through the app starting today. The Wi