In a medium saucepan, combine water, oats, pumpkin, vanilla, pumpkin pie spice, cinnamon. Bring to a boil. Turn heat down to a soft boil and cook for 4 minutes. Stir often. Stir in milk and your favorite sugar substitute, to taste. Cook 1 more minute or until desired consistency. Pour into a bowl. Add a dash of cinnamon and raisins and/or walnuts, if desired.