I looked at actual menus on the Disney website of various restaurants and it seemed pretty accurate from what I checked. I did a lot of googling for "Best Table Service in [park]" and best counter service, best snacks, etc to find the best value taking in mind both cost and quality of the places, but trying to chose the more expensive options.
https://thewdwguru.com/dine-wdw-dining-options/wdw-dining-snack-credit-list/
I found this helpful as well so thought I'd share. Planning to share some meals and supplement with snack credits as chicken fried rice, sushi, soups, etc.
I ended up managing approximately $1060's worth of food for $848 meal plan cost--in theory. Haven't tried it out yet though!
Hope someone else with more clear answers pipes in!