Add water, cinnamon, nutmeg, ground cloves, and vanilla extract. Cover and cook on low for 10 hours, stirring every few hours if possible.
Continue to cook on low to reduce the apple butter by about half, or until darker in color. You can also transfer to a large pot and reduce apple butter on the stovetop instead. Enjoy!
If you want the apple butter sweeter, try adding 1/4 cup dark brown sugar, coconut sugar or pure maple syrup to the apples while cooking.