Saute bacon in a large skillet until crisp. Drain bacon on paper towel. Crumble and set aside.
Add butter or margarine to skillet if necessary to make 1/4 cup of drippings. Add cabbage, apple, onion, salt, and caraway seeds, 2 Tbl. vinegar, and toss to blend well. Cook 10 to 15 minutes over medium heat.
Add noodles, cover, and simmer for 15 minutes more.
Stir in remaining vinegar, sprinkle with reserved bacon, and garnish with sour cream.