You cannot make true apple cider from apple cider vinegar
Apple cider vinegar is already fermented and acidic
If you want a cider-like drink, mix apple juice with a small amount of apple cider vinegar
Use about 1 to 2 teaspoons of apple cider vinegar per 1 cup of apple juice
Stir well
Chill before serving
Add sweetener if needed
Add cinnamon or cloves if desired
Do not use too much vinegar
Taste and adjust carefully