Keep doing what you're doing.
Great service for guests visiting Disney properties! Prices are significantly less than using the convenience stores in the hotels or eating out for every meal especially breakfast. I spent $140 for the week which covered all breakfasts and most beverages for a family of 5.
For a shopper from another country, you can't beat Garden Grocer's online aisles where you see what you're getting. for someone unfamiliar with American sizes and brand names, it made getting groceries for our trip simple.