This cider mother of vinegar is perfect for making up to 1 quart (32 oz.) of cider vinegar.
Directions: For hard cider 8%-10% ABV, add 8 oz. of mother to 16 oz. of hard cider to make 24 oz. of vinegar. For hard cider 11%-16% ABV, add 8 oz. of mother and 8 oz. of water to 16 oz. of hard cider to make 32 oz. (1 qt.) of vinegar. Place in glass, wood, or food safe HDPE plastic with a removable top or holes allowing for aeration. Cover holes or open top with cheesecloth to prevent insect infestation. Allow to sit 6-12 weeks. Best temperatures are 80-85 degrees Fahrenheit.
You can reuse the new mother from your vinegar.