We did the regular Dining Plan (don't recall the exact name) back in 2019 and found it worked great for the way we eat. Disney isn't currently offering any dining plans as I recall nor have they given any indication of when/if they might return, so that isn't currently an option. I think meal budget depends a lot of how much you eat and which restaurants you prefer. I would look at the menus posted on the official Disney website to do a sample day (or two) of what/where you plan to eat. I don't really think it needs to be overly complicated and with a couple of sample days you can get an idea of how much to budget for the entire trip.
Knowing your eating habits will probably give you the best indication of budget. What someone else eats/spends may not match what you choose to do.
Knowing your eating habits will probably give you the best indication of budget. What someone else eats/spends may not match what you choose to do.