Another possible option on the way to MK by resort loop monorail is either Captain Cook's at the Poly or Gasparilla Island Grill at the GF. These two will be the first stops along the resort loop route from the TTC with MK the third.
Gaspy's is open 24 hours. An early start can get you a nice QS breakfast or grab-n-go items. You'll have more healthy options at either here or CC's than in the MK.
I agree with a PP that getting a grocery delivery or picking up a few items at your resort's food court the evening before could work much better. That way, you can be ready to go without trying to find something everyone will like along the way.