COOK and stir chicken in large skillet sprayed with cooking spray on medium-high heat 5 min. Add peppers and onions; cook 5 min. or until chicken is done and vegetables are crisp-tender, stirring frequently.
STIR in tomatoes, water and Macaroni. Bring to boil; cover.
SIMMER on low heat 10 min. or until Macaroni is tender, stirring occasionally. Add Cheese Sauce Mix; mix well.