Combine the oats, apples, raisins, sugar, cinnamon, and salt in a large bowl and mix well.
Divide the oatmeal evenly among three jars (or resealable bags) and seal with a lid.
Store in a cool, dry place for up to 3 months.
Notes
Preparing the oatmeal--Add ¾ to 1 cup of boiling water to your jar of oatmeal. Stir well and let sit for a couple of minutes before eating. It will be runny at first, but will thicken as it sits.
Dietary--This oatmeal recipe is suitable for gluten-free, dairy-free and vegan diets.