I don’t think you’ll be able to get the prepared breakfast items like oatmeal and quinoa the night before because they won’t be serving them. You would have to get them in the morning. I don’t think either item would be very good reheated.
Since AKL has DVC villas in Jambo and Kidani, there is a decent selection of food in the shops there for purchase. I can’t remember exactly what they have but you should be able to get things along the lines of a box of instant oatmeal, granola bars, yogurt etc. in the little market if you want. We have bought breakfast items like that in the shops in the past.