The absolute essentials are food water shelter and security.
For food, MREs are ok, but I like freeze dried meals like mountain house better.
Water, you need containers and filtration.
Shelter would be a solid change of clothes and something to shield you from the elements. Rain poncho, emergency sleeping bag, etc.
Security. You didn't mention a pistol but I'm assuming you are using your EDC.
I'd also have redundant ways to start fire. A solid fixed blade would be invaluable. Make sure some good boots are part of the equation. Some para it's would be very useful, along with duct tape. A first aid kit would be good as well.
A multi tool is very handy as well. Some spare cash too.
It doesn't really need to be too extensive, it's just to get you home, a 24hr bag at most.