Place the water and coconut milk in a medium pot and bring it to a boil. Add the oatmeal, pumpkin pie spice and salt and stir to combine. Bring to a boil and cook for 1-2 minutes. Watch it and stir/adjust the heat as necessary as it has a tendency to boil over.
Turn off the heat and place the lid on the pot. Let it sit overnight.
The next morning, turn the heat onto medium and stir the oats. Stir in the pumpkin and maple syrup. Cook for 10 minutes until heated through and soft. Enjoy! Leftovers store great in the refrigerator for reheating.