If they have 4K planned I agree w/ the onsite recommendation.
But the question was food allowance. One year we did our family of 5 for as little as $150 a day when the budget was tight. No fancy or character meals that trip. We brought and ate breakfast in the room most days, had snacks we carried in and water bottles with the powder packs for everyone. It was the trip we realized how relaxing it was not running for ADR’s every day. And we still had $$ left over each night for a snack or two in the park for everyone.
Since the 4K does not include their room cost offsite they are in really good shape. One onsite saving for them would be parking cost. That alone would = a CS lunch for each child every day if they eat a lot. $200 per day should be very comfortable for them if they utilize other saving tips I’m sure you have passed on from your many trips.