Add the ability to carry water or filter water, small non-descript backpack, tourniquet in the med kit. Smacks, ibuprofen and acetaminophen if not already in the med kit. Baby wipes in the car are a blessing, next to a case of water in the car, hand sanitizer has many uses.
If you mean return to home by 'home base' never let the gas get below the range needed to return home. When I'm traveling mounted (truck or car) a carbine and mags are never too far away. A rifle solves a lot of problems.
Depending on the SHTF, have a plan to cover ground quickly before everyone else understands the urgency of bugging out, Map two routes of return, one highway and one backroads just in case.
Decide in advance what you're willing to leave behind to gain time on the return to home base.
My wife used to think I was over worrying, then 2020 happened.
Read the "Black Autumn" series of books. A lot of stuff I wasn't planning for are discussed, and now incorporated into how I think.