Combine all the ingredients in a large slow cooker and give it a good stir. Cover and cook on low for 7-8 hours. Heat a saucepan with the water and sugar until it begins to boil. Ensure you stir the mixture constantly. Add the sea salt and coconut oil (or butter) and continue stirring on medium heat until it thickens and remove from the heat. Drizzle desired amount of salted caramel sauce into the oatmeal and mix well. Transfer oatmeal to bowls, if desired, add a scoop of protein powder (1 serving per bowl) and add a dash more milk. Top with caramel sauce and sea salt and any other toppings and enjoy.