No rye? Try pumpernickel. Can't find capocollo? Use salami, pastrami, or ham.
To make dry bread cubes, preheat oven to 300°F. Cut fresh bread into 1/2- to 1-inch cubes. Spread the bread cubes in one or two 15x10x1-inch baking pans. Bake for 10 to 20 minutes or until cubes are dry, stirring twice; cool. (The cubes will continue to dry and crisp as they cool.) Or let bread cubes stand, loosely covered, at room temperature for 8 to 12 hours.