7‑Eleven announces the return the SOUR PATCH Watermelon Slurpee flavor   IRVING, TEXAS, 2018-Jan-15 — /EPR Retail News/ — The KIDS are back in town … both sour and sweet. 7‑Eleven, Inc. is bringing back the SOUR PATCH Watermelon flavor to the Slurpee® machine. The drink is the most popular limited-time flavor in the history of the iconic semi-frozen beverage,…