Mix Marinade, oil, vinegar and water in small bowl until well blended. Remove 2 tablespoons of the marinade to a separate small bowl and stir in mustard; set aside.
Place chicken in large resealable plastic bag or glass dish. Add remaining marinade; turn to coat well. Refrigerate 30 minutes or longer for extra flavor. Remove chicken from Marinade. Discard any remaining Marinade.
Grill chicken over medium-high heat 6 to 8 minutes per side or until cooked through, brushing with mustard mixture.