Cover the raspberries with coconut sugar and mix well.
Cover and place in the refrigerator overnight. After 8-12 hours, stir the mixture and place back in the fridge. Do this a few more times over the course of 2 days, covering the mixture up after each stir session.
After 48 hours, strain or blend the fruit to make a smooth fruity mixture.
Add the apple cider vinegar, stir and use right away or place in glass jar for storing in the fridge.
To serve, place a 1:2 ratio or 1:3 ratio of shrub base to cold, unflavored seltzer (depending on your preference of the shrub flavor's strength). You can serve this with ice, but it may dilute it quite a bit. I prefer serving it with frozen raspberries to keep it cold and fun!