Rancher is spot on about having a "clan" or tribe. I call it a MAG (Mutual Aid Group). And you need a skill or asset that enhances the survival of the group. All of us here have that skill. We can cast bullets and reload ammunition. But that takes some thought and planning.
Being able to cast and load for the .38/55, .32 WCF etc, is far less desirable than .308/.30-30. Pistol .44 Mag or .460 Mag is not as useful and 9mm or .45. I have stuff to load calibers I do not own because people in my MAG have .270's, .30/06's etc. Not difficult or expensive to be equipped to do so. I buy stuff when I see a "good deal". Something useful to add is loading 20 and 12 ga. I keep wads, 20 bags of bird shot and molds to cast buckshot and slugs.
Build (or add on to) your arsenal with calibers likely to be scrounged or "liberated". The .223 is not highly thought of, but you are not going to find a lot of .277 Fury's or .300 BO's on dead bodies. Same for pistols...9mm will be everywhere compared to .357 Mag.
A MAG without a doctor, nurse or veterinarian has much less chance of making it as well.
Just stuff to ponder.