In a large saucepan or pot over medium heat, add water and coconut milk.
Stir oats and salt (and optional spices) into liquid and reduce to medium-low heat to keep a low simmer.
Cook 20 to 30 minutes until mixture is thick, stirring occasionally.
Turn off heat and add any garnish or mix-ins you like. Allow to sit about 5 minutes before serving.
Store in refrigerator up to 5 days or scoop ½ cup portions into muffin tins and freeze then pop out, move to freezer bags, and store up to 3 months in freezer.