Place both ingredients in a glass jar, leaving some space between the liquid and the top of the jar in case the liquid fizzes and expands during the ferment.
Stir liquid with a wooden spoon and leave on the bench to ferment for 24-48 hours, tasting after 24 hours. In warmer weather it will ferment in 24 hours, and for cooler climates, 48 hours is needed for all the sugar to be eaten up by the beneficial bacteria.
Once the Apple Juice Kefir is ready, use 1 cup to start your next batch and transfer the rest to the fridge. You can make 10 L of apple juice from your initial starter (saving 1 cup per 2 L batch), before replenishing your starter supply from Kultured Wellness.