You can buy a cheap shotgun for around $150 then buy some ammo, enough to defend yourself.

Me personally? I have no friends, I am an anti social introvert, I do what I can, work, and play video games. If I come across anyone after a collapse, I am treating those people as potential liabilities, Who are hostile to me and my well being. I think I would be taken care of when it comes to acquiring food and supplies.

On a darker note. I always imagine myself as being a trapdoor spider, and anyone who gets close enough for me to snatch, and drag into my hole, will become a meal. This goes for animals and humans alike. Have enough of a stash for when I am found, I can release a large ammount of ultra-violent attrition; enough to blast off and get away from the hot zone. Then if that is the case I would become a brown recluse, hunting at night, while taking cover during the day. I would liken myself to the lone wanderer, until I finally meet my demise. I am paranoid,and will likely back stab those close to me, just as I would expect them to do the same to myself. Maybe gather a couple breeders to keep in cages, then rear their offspring myself, teaching them the ways of destruction, and subterfuge.

In it for a fun time, not a long time. Live and learn, crash and burn, gotta survive, and await your final turn.