Mix Marinade Mix, water, oil and vinegar in small bowl. Place vegetables in large resealable plastic bag or glass dish. Add marinade; turn to coat well.
Refrigerate 15 minutes or longer for extra flavor. Remove vegetables from marinade, reserving marinade.
Grill vegetables over medium-high heat 2 to 4 minutes per side or until tender-crisp, brushing with reserved marinade halfway through cooking. (Grill tomatoes about 2 to 3 minutes per side.) If desired, drizzle vegetables with remaining marinade.