WE bring (that is different from a 'regular' hotel trip)
Coffee filters, salt and pepper, sugar, ground coffee, cereal, shampoo, conditioner, peanut butter, jam, laundry detergent
We buy milk, half and half, eggs, orange juice, 2 liters of Coke and a bottle of booze - usually just down at the little grocery (BWV - Screen Door).
I suppose I could throw shampoo, salt and pepper, coffee filters, sunscreen, etc - plus some of our 'only at WDW' stuff (extra hats, rain ponchos) into an owners locker, but we've never bothered.