I’m swapping the first-aid kit for the crossbow, but spot on for the rest. Body armor is rare and definitely raises your odds of survival in the short term after the initial spread. A machete is the ultimate all-purpose blade, good for defense as well as butchering, breeching, and it is easily maintained. And the water purifier is a no-brainer. Waterborn diseases are a real problem in any situation where public utilities become inaccessible and clean drinking water grows scarce.
Assuming that I am obviously able to expand my kit as I survive, the ranged weapon that uses easily craftable ammo would be ideal. A first aid kit could be cobbled together over the course of a few days of persistent scavenging. No promises on the crossbow, they are far less common than bandaids, gauze, sterilization solutions, and splints. Really the thing that would likely be the hardest to source is the suture needle that you should have in there.
I always loved 10k in Z-Nation for using the wrist rocket slingshot because that is truly the king ranged weapon for a survival scenario. Lightweight, ammo that is infinite and easily accessible, and lethal out to ranges that matter. Not to mention that they are very easy to maintain and repair.
All that said, I would likely accumulate the aforementioned electricity/fuel items as I am familiar with the production of biofuels and can build some alternative generators (wind, methane, solar concentrators) for electricity once I have somewhere secure. Methane in particular has always been attractive to me for survival scenarios because anaerobic decomposition is a great way of dealing with biowaste and what is left over ends up making really good fertilizer. Just need a couple of propane tanks, some steel, and a car battery to rig as a welder and you can turn one into a digestor and the other into storage, then get a couple 2 cycle lawnmower engines and some AC motors and you can get a power supply running. At least enough to run some incandescent bulbs. Need a voltage regulator for more complex electronics to keep the line clean, but that is a different conversation.