Machete, Water Purifier (provided it does not need electricity to work), German Shepherd and the tent. If the water purifier requires electricity, I’d opt for the body armor.

Stuff that requires fuel, electricity or ammo will become obsolete after a certain amount of time, so the flashlight, crossbow, motorcycle, chainsaw etc. only have limited use and become dead weight eventually. The first aid kit might help with “regular” injuries, but is likely useless against zombie bites getting infected with whatever virus is responsible for their mutation. The respirator mask is only useful if there’s something dangerous in the air, and will only stay useful until the filter gets too dirty / too old and needs to be replaced.