Do you have a big freezer? If not you should get one. Then you can fill one entire tray with it and always have some ready to go.
I can highly recommend having one filled (one tray each) with: * Bread and Toast(s). Best cut in slices before freezing then it can go directly into the toaster. * Cheese (I've usually 3-4 different ones, max 400g per block) * Protein (e.g. Meat, Fish, ...) * Meals you pre-made * Ice(-cream) * Different sauces in very small packaging