You have the tools.....:)
Between yer ears buddy.
Not complex at all...
12 gauge an a handgun for defense with a bow or .22 for pot meat.
Murphy's Laws apply equally to bad guys and good guys. Unless someone is so stupid that random chance is more powerful.
Remember, you also get a vote in the enemy's plans, too.
The feral will start out killing and eating their own weak as their easiest first step. Their surviving weak will quickly learn the value of "the great equalizer". Not everybody on the wrong side of the line is your enemy.
Deception works both ways. Some "weakness" in your defense may be your setpiece ambush for somebody who sees what they want to see because it worked in the past. Study your own situation as if you were the enemy, and then add in your own touch of "something extra" for the enemy.
Teach everyone in your group how to spot the alpha, and the prime beta. In a firefight, every weapon should be used on them until they're down, making the remaining omegas easier game.
I personally will not defile an enemy body, but that won't stop me from using spray paint or a magic marker to leave some "inspirational" message on the corpse. Even bad guys get worked up seeing a hacked-up comrade. There's a different reaction when the corpse has a sign with a happy face on it, or "thanks for the weapon, as crappy as it is" on the sign. Hat-tip to Bruce Willis in Diehard 1 for that.