Hi Dawn!
You can use Garden Grocer, which is not owned by Disney, but it is an online grocery delivery service that delivers to the Walt Disney World resorts.
You can place your order ahead of time on their website and arrange for them to be sent to your resort. It's definitely beneficial to book well in advance, as they do have surcharges for same day and next day delivery. There are also discounts for ordering in advance.
Another option is to buy the essentials you need when you arrive at the on-site store at the resort. Many of the resorts have stores, such as the
Settlement Trading Post at
The Campsites at Disney's Fort Wilderness Resort, which offer grocery items, snacks, beverages, water, cleaning supplies, toiletries and more.
I hope you have a magical vacation!
Magically,
Stacy