i mean, maybe the best prepping is going to a gun club and making friends there because, if shit pops off in any meaningful way, i mean, like a societal breakdown type thing, raping and looting starts happening fast, and lone wolfing would only work if you were already living in some isolated cabin and were basically sustainable

if it was more of a prolonged suck, but not full Mad Max situation, the best prep should probably include basic medications, things like hydrogen peroxide, first aid etc

if you can grow food , get a borhole, have chickens things like that, you'd be alright, although i dont know how many urban stackers fit that bill.