Buy, "The Way things work, vol 1+2"
I like hot showers, so the black bag camping shower is nice to have. Mountain bike and plenty of spare parts is also handy.
I had a few buddies in Texas who were totally prepared for when the zombies come. Hundreds of gallons of diesel fuel, with fuel stabilizer, in tanks buried in yard, generator, food, ammo, etc. Not far from Huntsville, I could tell you where, but then I would have to kill you.