A good knife....I have a real K-Bar and a EK commando. I was trying to sell the K Bar to a guy at work. I told him I wanted 50 for it and he said he only buys 10 dollar knives.
Knives are overlooked but a good multi-purpose knife is worth its wieght in Gold.
If you have the space,buy 2x4 lumber. about 20 or so. Use them for shoring up or securing damaged doors.
If you really have the space,plywood...4x8 sheets.
I have a Gerber Mark II Combat, several good folders, and a number of Swiss Army Knives. . . And in a pinch, there’s always the bayonet that came with my Mosin-Nagant... (evil grin)