Thanks for the great question Joyell! I'm all about the Key to the World card while at Disney World! It's so easy and very handy! Being the serious shopper that I am, you wouldn't want me to give advice on how much to spend! However, I can guide you in being well prepared!
To figure out how much to spend on food, first check out the
Disney Dining page on the Disney World website. This will help you plan where you'll be eating. Another site to check out is the AllEars website. They list menus for all Disney dining experiences, including current prices, so this will help you budget accordingly. It also includes snack prices, so you can plan in detail!
We always end up going home with super cool Disney Souvenirs. You can visit the
Theme Park Merchandise website that will let you know what's available in the parks, and how much you can expect to pay. This will give you a better, more realistic, idea for a souvenir budget.
Hope this helps Joyell! Write back with any other questions!