Rather than collaboration, can I suggest the apocalypse to be smarter with survival element?
Aside from canned food, people can also try to farm, right? Many apocalypse novel tend to forget this. Only if your novel mention something like extreme changes in weather or impossible to farm because of the world condition blablabla can you forget farming.
Aside from using gun, it is better to use axe or knife to cut the zombies neck. This way, it won't be too cliche for the character to die.
It is better to be gruesome in the novel like cutting your arm when you are bitten. Apocalypse is already gruesome genre to begin with so the additional element shouldn't be too much right? It will even be realistic.
The Attack on Titan country is also a good reference to apocalypse surviving.
The world is advancing so why the novel remain kuno? There are plenty cars using solar energy and there are huge trucks everywhere to push the cars that blocking the road to the side so your car can move on.
The zombie is evolving but why is your character not? As the zombie evolve, your character should be able to have some wisdom or idea to how the human can survive or perhaps some ability or enhancement in their body? They can't possibly remain the same unless you want your story to receive bad reviews for your bad ending. This is not a short story or a movie so you cannot possibly ask your reader to love bad ending!
Apocalypse no toride is a good manga, read it.
Last but not least, the an apocalypse world should not be limited to only human and zombie. Beasts, plants, the world itself can also mutate. Also, watch the youtube that has a video telling a theory what happen if the human suddenly disappear from the earth.
You will see that the nuclear powerplant will release dangerous gas because no human operate it. This will show you just how unrealistic the other apocalypse novel are.
If you want to make an unrealistic apocalypse novel, then don't make a realistic one and started getting creative! Magic, supernatural anything, add in the genre into your novel. If you want to make it realistic, then make it as realistic as possible. Do a research!