Add sliced apples and oranges to large slow cooker. Don't worry about peeling them, you will strain later. Add cinnamon sticks, nutmeg, and cloves to the slow cooker. Fill the slow cooker with water almost all the way to the top. For me it was about 14 cups, but you can use more or less.Cover slow cooker and cook on low 8 hours or high 4 hours.After the cooking time, take a potato masher and mash the fruit fully in the slow cooker. Go slowly so you do not spill the water over the sides.Pour cider through a strainer to remove any of the large fruit chunks and spices.Follow by straining again through a fine-mesh strainer to make even more refined. Press the mixture through the mesh to get all the juice out that's possible. Return the remaining cider to the slow cooker.Stir in stevia, agave nectar, and caramel. Stir in alcohol if desired.Keep on low while serving, or refrigerate for up to 4-5 days in an airtight container.Serve hot, garnished with apple slices, orange slices, and cinnamon sticks. I dipped the rim of the glass in caramel sauce for some extra fun.Enjoy!