Hello, Lois! Welcome to the Disney Parks Moms Panel.
Mickey's Pantry is one of my favorite stores in the Downtown Disney area. Here you can find Disney themed kitchen gadgets, dishes, and other kitchen related items. You can find some teas and other specialty food items such as Mickey shaped pasta, however It does not sell the grocery type items that you are looking to take back to your hotel for breakfast.
Fear, not Lois! Each time we stay at Walt Disney World, we order groceries from an off-site grocery delivery service. There are several companies to choose from, however we have always used Garden Grocer ourselves and have been very pleased. You can log right onto their website to order breakfast and snack items. You are able to specify your resort as well as the date and time you would like your items to be delivered. If your groceries arrive before you do, bell services will store these items for you and you may retrieve them as soon as you arrive. It is as simple as that! We typically order bottled water, milk, juice, fresh fruit, breakfast pastries, granola bars, etc. It is very convenient to have these items right in the room. My kids will typically eat their breakfast while my husband and I get ready for a day of adventure in the Parks.
Have a magical vacation, Lois!
~Rachel