Combine the prepped apples and water in your slow cooker. Latch the cover on and cook it all on low for 4 hours. When the four hours are up, stir in the brown sugar, cinnamon, vanilla and apple cider vinegar. Put the cover back on and let it cook on low for another 2 hours.
When it's done, turn off the slow cooker and let the applesauce cool for 30 minutes. Then just seal it in a container, refrigerate it, and use as needed for snacks, pancakes, and so many other recipes! This recipe yields almost a quart of apple sauce.