Mix cranberry jelly and 1 cup water; bring to a boil. Add cranberry gelatin; stir to dissolve. Season with dash of salt, then chill until set in a lightly oiled 3-quart glass dish. Soften unflavored gelatin in 1 cup water in top of a double boiler, heating until dissolved. Add mayonnaise, milk, salt, and celery. Pour over set cranberry layer, add chopped turkey, and chill until set.