Cut the apples into quarters (cored but not peeled). Cut the orange into slices.
To a 7 or 8 quart slow cooker, add the quartered apples, orange slices, cinnamon sticks, whole cloves, and sugar. Add in the water, enough to submerge the fruit and give it a stir to combine.
Set the slow cooker on HIGH for 4 hours. Then, remove the apples and mash them using a fork or a masher. Return the mashed apples, including the bits and pieces and extra liquid, to the slow cooker. At this point, add more sugar to taste if desire. Cook the cider for another 1 hour on HIGH.
Strain the solids through a fine-mesh strainer or cheesecloth. I usually strain it into a large pot, and then return the liquid to the slow cooker to keep the apple cider warm on the WARM setting, but you can serve it cold too.
If desired, garnish with fresh apple slices, fresh orange slices, fresh cranberries, and whole spices of your choice. Enjoy!