Brown sausage, celery, and onion together; drain. Add sausage mixture, bread cubes, butter, and sage to cornbread. Mix well. Add broth, water, and eggs; toss lightly until bread is thoroughly moistened. (Add 1/2 cup additional water if more moist dressing is desired.) Place dressing in casserole and bake 30 to 45 minutes at 350 degrees until set.