Just rediscovered what's now my favorite . . "Panic in Year Zero".
Even though it's an old B&W 60's film, there's just something about this story of a man's attempts to keep his family safe after a nuke attack on L.A.
Locating & obtaining food, weapons, & tools; locating & attempting to conceal a retreat, hiding cashes of food in case their main location is discovered or for trade if captured; bartering ammo for medical services; etc.
Yeah, there's lots of good ideas represented in this oldie.