Well the good thing about living in suburban America is the trash people throw away.
There are plenty of objects to be found just walking around poking through waste dumpsters.
People throw away everything!
I believe that the environment will drastically determine the tools.
If there is nothing but woods around, then ultimate survival skills kick in.
Rocks, trees and water are your friends in those areas. Being creative is crucial.
If you have areas of farmland or sparsely settled villages, you are better off.
Finding items from remaining autos, equipment and homes is a treasure trove.
Making something useful...now that is up to the finder.
As for large cities and developed areas, those are easy pickings.
Using your mind is 70% of the tool itself.
What one person decides is a wrench, another could say its a hammer.
Take an old bicycle for instance...
Finding bicycle tires and cutting the tubes out to use for straps on a slingshot that can easily be made from the fork of a steelwood tree branch.
Using the spokes as a makeshift grill, sometimes they are stainless.The frame can be hacked away and formed into very powerful weapons like making a
solid pipe from the cross member or a pitchfork from the front fork.
Also, it in remote areas, railroad tracks always have treasure...
I always look for thicker glass from old telephone poles (insulators). Usually found in older areas where railroads ran through or old telegraph wire
was run. They are excellent to knap and form into points or tips. The steel pins or railroad spikes are a plenty along the tracks and make excellent
hammers, wedges or use a useful blunt object to strike with. There is always tons of iron ore pellets along tracks too. Excellent Mmo for the
slingshot you just made out of the bicycle tires.
Get creative and stay alive!