

Paracord. I use it in the house as well as with my SCUBA diving gear. If you need to tie something it’s tough stuff, fairly cheap, and can be doubled up to deal with heavier loads. With SCUBA gear you can use it to create tethers for just about anything and if you have one of the camera floats that comes with a cheap little keeper strap save yourself some heartache and replace it with paracord.
An assortment of screws, bolts, nuts, and washers. Always worth having around. Some little thing breaks or you can’t find one you dropped maybe the new thing you are putting together was missing one. Bonus tip, buy them at a place that sells by the pound and not the individual item. Atwoods is a place in the US that still does this that I know of but I’m sure there are a few others. Estate sales will also often have a person who will have jars of random stuff for cheap.

Never hitchhiked myself. Picked up a few over the years.
Last one was a guy from Germany who was walking from a wildlife refuge campground in to town to go to a museum. It was 21 miles to get there so the museum would have likely been closed by the time he got there. It was also forecast to be in the upper 90’s and quite a way before any services would have been available. He may have made it but I doubt he would been feeling too good with the amount of water he had.