Prepare your 5 quart slow cooker by spraying slow cooker with non-stick cooking spray.
Add all ingredients. Stir to combine. Cover and cook on high for 1 hour or low for 1-1/2 - 2 hours.
Serve and enjoy!
Notes
Prepare the night ahead. Add apples, craisins and butter to a zip lock bag. Refrigerate. Combine oats, brown sugar and salt to a separate zip top bag. Set aside. In the morning pour both bags into slow cooker, add water and turn on.To reheat oatmeal, add a splash of water or milk to a 1 cup of oatmeal and microwave for 1 minute (more as necessary). Overnight cooking method: Follow recipe as listed, cooking on low for 6-8 hours. Oatmeal will be very soft and porrage-like.