I just went to the Orlando for a few days a couple weeks ago.
One day, I had a little 8oz can of sprite with me that they wouldn't allow in. But then the next day, I walked right in with a Starbucks coffee and breakfast sandwich from the hotel. I think the only drinks they officially allow in are one unopened 20oz water bottle per person, milk and stuff for babies, and then anything medical- or perhaps religion-related.
Foodwise I've had slimjims, fruit gummies, halloween sized skittles, etc and have never had a problem with them. Even back when they'd individually search each bag. I saw people with backpack coolers on this past trip. Saw someone with a full checked-baggage size suitcase walking around (could have been an approved vendor or something but not dressed like an employee). I saw someone sitting down at the Jurassic Pizza place eating Chik-fil-a with the bag just sitting there and a large soda in their cup. Might have been a back of house employee as they were just wearing jeans and a T-shirt. But my nephew got excited and asked if there was Chick-fil-A there.
Since they just run your bags through an X-Ray machine, I'd have to assume a few sandwiches in baggies wouldn't even register with them. If you have a cooler, with ice packs and then the sandwiches...maybe they'd have an issue? If you have young children with you, I think that might give you a little more leeway.
Also, if you are staying on site and coming in through the side or boat security, they seem to be much more lenient than the main/parking garage entrance. It was cold and we all had jackets and/or hoodies on and they didn't ask a single person to take them off and run them through the X-Ray machine unless they set off the metal detector. I could have had 6 sandwhiches stuck in my hoodie pocket.