I have looked into Garden Grocer as well and just couldn't justify spending that money (but we're driving as well so that opens up a lot of options). We're taking a mini fridge along and packing 2 1/2 gallons of milk, some yogurt, fruit, ham/cheese, bread, peanut butter & jelly and a few snacky things like cereal bars, animal crackers, goldfish crackers, etc. We're going to have the minifridge plugged in the van so it'll stay cool while we're driving. When we stop, we plan to stop and buy bags of ice to put in it to keep everything cool overnight or during the day and cover the fridge with blankets. I hope this works but it could also be a disaster. We'll be arriving at WDW early Sunday morning and going to the parks till about 4 so our fridge won't be unloaded till then
I sure hope everything stays cool in that Florida heat.