Preheat oven to 350°. Cook noodles according to package directions until al dente; drain. In a large skillet, cook the beef, onion and green pepper over medium-high heat for 10-12 minutes or until meat is no longer pink; drain. Stir in the noodles, soup, cheese, water and chili sauce. Transfer to 2 greased 8-in. square baking dishes.
Toss bread crumbs and butter; sprinkle over casseroles. Bake, uncovered, 35-40 minutes or until bubbly and golden brown. Freeze option: Cool unbaked casseroles; cover and freeze up to 3 months. To use, partially thaw in refrigerator overnight. Remove from refrigerator 30 minutes before baking. Preheat oven to 350°. Cover casserole with foil; bake as directed, increasing covered time to 45-50 minutes or until heated through and a thermometer inserted in center reads 165°. Uncover; bake 10-15 minutes longer or until golden brown.
To make soft bread crumbs, tear bread into pieces and place in a food processor or blender. Cover and pulse until crumbs form. One slice of bread yields 1/2 to 3/4 cup crumbs.