COOK and stir chicken in large skillet sprayed with cooking spray on medium-high heat 5 min. or until chicken is no longer pink. Add peppers and onions; cook and stir 5 min. or until chicken is done.
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; stir until blended.