Cube bread. Add onion, celery, water chestnuts, salt, poultry seasoning, parsley, and pepper.
Brown sausage in fry pan. Remove sausage to already combined ingredients.
Drain off all but 1 tablespoon of drippings from fry pan (if present). Add water to fry pan containing reserved drippings and loosen browns from bottom of fry pan. Sprinkle over bread-sausage mixture until damp, but not soggy.
Can be made ahead to be ready to stuff turkey in the morning. If stuffing turkey ahead of time, thoroughly chill dressing. If baking separately from turkey, add chicken broth to keep moist.