Preheat oven to 375 degrees. In a hot skillet add heat oil. Then add green peppers, onions, and garlic. Sauté until softened. In a 9x13 or 3 quart casserole dish generously spray with cooking spray and then add cooked peppers, onions, and garlic, turkey sausage rounds, raw chicken breast, rice, cream of chicken soup, diced tomatoes, cajun seasoning, celery salt, and water. Mix together well. Cover casserole dish tightly with aluminum foil and place into preheated oven for one hour or until rice is cooked. Lightly fluff with a fork.