What “threats,” obstacles, etc do you expect to encounter on your trip home?
For example, I keep a folding pruning saw in my trunk in the event of a smaller downed tree blocking the road and a tire patch kit in the even I need to plug a hole and don’t want to stop to change the spare.
For short distances, your usual daily carry gun will be fine, and just add an extra magazine in your bag that you can throw in your pocket. But for a long slog, you may encounter several “threats” so an SR22 and 4-6 magazines and a brick of 500 rounds is the equivalent to a nest of angry hornets and enough to keep a small group at distance, even if not as lethal as other calibers. I think a Mark IV 22/45 is just as reliable (if not more so) but isn’t as concealable. A Ruger LCR in .22 make for a great lightweight backup pocket carry.
I like GU packets and chews and protein bars and one MRE or dehydrated meal for my calories. I find peanuts and beef jerky harder to digest and make me less popular company with those hiking behind me. Carbs and caffeine will fuel the endurance for miles like any marathon runner/cyclist, but eventually you’ll need easily digestible proteins that taste good — any caloric dense food (think power lifter recovery bars). Also you’ll need to rehydrate, so water purification tablets, and a single walled aluminum bottle and lighter so you can boil if needed for purification. I like the citrus flavored electrolyte drink mix.
Any gear you should get should be ultra light and durable since your purpose is to only get home (think AT thru hiking versus car camping). Emergency blanket or poncho. Avoid the $3 Mylar and upgrade for the $8-12 higher quality items.
Cordage to mend boot laces, make a hasty shelter, lash items to you pack, etc
I like the SWAT tourniquet because it can also be used as an improvised knee or ankle compression wrap.
Make sure you have maps to cover your entire route and a cheap compass.
so many things…