I talked to a guy who tried to cross it once. To get the huge number of required calories in a compact form they drank olive oil. He didn’t like it and it sure sounds nasty.
https://www.instagram.com/p/BqOWpIMl7Si/?utm_source=ig_share...
7000 calories a day!
Eating sticks of butter is common too.
Looks like a >4:1 carb:fat ratio by weight.
(speaking from experience)
Fritos and Nutty Buddies were my go-to. I added a few notes about my trip here: https://pkshultz.com/at/
Since you're such a recent finisher; Springer Fever is a real thing, and I think it's best not to suppress it too much.