Preheat oven to 350. Prepare a 2-quart casserole dish with cooking spray; set aside. In a large saucepan, cook chicken until no longer pink. Stir in chili, tomatoes, and water. Mix well. Bring to boil. Fold in rice. Cover and remove from heat. Let stand five minutes. Place mixture into prepared dish. Sprinkle cut up cheese on top. Bake for 15 minutes, or until cheese has melted and dish is heated through.