Ann'S Chicken Casserole
["5 c. rice", "2 c. (or more) chicken (cooked)", "1 1/2 c. celery, chopped", "1 small onion, chopped", "1 c. mayonnaise", "21 oz. (2 cans) soup, cream of mushroom", "8 oz. (1 can) water chestnuts", "2 to 3 Tbsp. lemon juice", "1 c. bread crumbs", "1/3 c. (2/3 stick) butter or margarine, melted"]
["Cook rice according to package instructions and set aside."]
["rice", "chicken", "celery", "onion", "mayonnaise", "cream of mushroom", "water", "lemon juice", "bread crumbs", "butter"]