MIX dressing mix, oil, tequila and lime juice until well blended. Pour over shrimp and vegetables in shallow dish; cover. Refrigerate 30 min. to 2 hours to marinate. Remove shrimp and vegetables from marinade; discard marinade.
PREHEAT grill to medium-high heat. Arrange shrimp and vegetables on skewers.
GRILL kabobs 5 to 8 min. or until shrimp turn pink and vegetables are crisp-tender, turning after 4 min.