Free 20 oz. "Texans" Slush at Sonic Tuesdays After Houston Texans WinThis season, the Houston Texans are giving Houston fans a treat after every win. Take advantage of a free 20 oz. “Texans” slush all day Tuesdays (cranberrry & cherry) after a win. Thanks to a win over the 49ers Saturday night, get your free slush August 21. I got mine last Tuesday, and it was yummy — and free!