O.k., how about a combination tool like a Leatherman? I carry a 'Wave'
model and find it useful for everything from retrieving a ring from a
garbage disposal to cutting wire, to replacing a washer in a faucet.
I have also been looking at a Victorinox model called a 'Spirit', which is
nicely ergonomic and less bulky than Wave. It has scissors and a saw,
just like my Hunstman swiss army knife-which I am never without.
Actually the most useful item I own is probably a set of tool heads that fit
into a handle, like sockets. I think I paid $2 for it originally, in a Mom and Pop
hardware store. They had a bargain bin with assorted cheap tools.
The handle and 'heads' fit into a nice little sturdy plastic box. It includes various
screwdriver heads with varying widths and diameters; a screw starter and
a spike punch.
My Stepmother used to be very protective of her brass hammer. It was a
small thing, but had several descending sized screwdrivers inside the handle.
My father never took it seriously, but I did. I watched her repair an heriloom
dresser with it. It was just the thing for finishing nails.
I've also got a box of assorted nails, screws and glue and tape.
When considering TEOTWAWKI type scenarios, I've always thought one
should consider what tools would be required to build a secure dwelling
from scratch. Largely because my personal 'trade' skills run more towards carpentry.
A good shingle hatchet; an even better clawhammer; axes-I saw a PBS
special where the resident "toolman" opined that a double blade with a
two-foot shaft was ideal; wood chisels of varying widths; saws; planes; drills;
a level, etc.
Keeping in mind that, even if you do move to a showpiece, laughably fertile retreat farm or fortified mountain redoubt, that, sooner or later, it will be your roof that needs fixing. Or the barn. Or the shed(s)/chicken coop.
What about lubricants? I have a can of three-in-one oil and some WD-40
and silicon stuff for firearms. Is that enough?