From the Recipe Box ...
Barely cover ripe berries with malt or cider vinegar, gently crush to allow juices to flow, and let stand three days.
Strain, allowing juice to drip overnight. Measure juice, and add ½ cup of white sugar or mild honey for each cup of liquid. Mix together and boil gently until sweetening is dissolved.
Skim off any scum that forms. When cool, bottle and cap tightly.
A teaspoonful mixed with water is an excellent thirst quencher, especially welcome