1. Spread bread cubes on large cookie sheets; place in very slow oven (250°) for 10 minutes; remove from oven; reserve.
2. Cut sausage into 4 thick slices. Brown 5 minutes on each side in a medium-size skillet, then break into small pieces. Cook 1 minute longer, or until no trace of pink remains. Combine with bread cubes in a large bowl.
3. Pour off drippings from skillet; measure and return 2 tablespoons. Add onion and saute until tender. Stir in water and apples; bring to boiling. Pour over the sausage mixture; add salt and toss lightly until evenly moist.