Zombies will start to fall apart before too long, insects will start chewing on them, laying eggs in them and so forth. Wild animals will begin to tear off parts of them, exposure, a nice cold winter will break them down, their bones will start to wither and I'd say within a year the 'zombie' hordes will soup. So it will be a matter of keeping out of their way for a year or two till they've all fallen apart.
Weapons to kill the zombies? Not a whole heap but there is a hardware store not that far away, and I live in an apartment and if most of the people in the apartment are gone or are zombies, it'll be a matter of breaking, entering and looking around for tools, weapons, food and so on. I live right near a supermarket, and as long as I'm just one of a few people who survived we should be able to make things last a little bit. There are two big fucking ovals within walking distance and a nursery and a library, and the nursery sells seeds. So I can find a book and get to farming, which will be trial and error and I don't know if I'll make it. If I can get onto the apartment roof I can put out containers to collect water, not the best idea but what can I do. I live near the wilderness and I know how to get to large areas of water, but they're polluted BUT!!!!! Maybe, give it some time and with the human population gone, perhaps the water will begin to clear a bit, not to mention I can collect water from sandstone waterfalls and then boil the fucking shit out of it!!! Meat? That'll be a problem unless I can find some chickens which some people around here might have. I've raised and looked after ducks and chickens before, so that's no problem.
The other problem is other human beings, if I can get things set up a bit right I know a place, a suburb which is like a small town that only has two entrances. If I can set up shop there with my wife and maybe a few good people, or even if it was just the two of us, we might be alright. But things are going to go wrong, they always do. But I'd rather stay at my apartment. Being near a supermarket I'll have a shit load of soap for a while, but not forever. I will not have my epileptic medication so that's a problem too, I will find it difficult to live on my own. So I hope my wife survives too, and my cat.
Sanitation? Eh, I've shit in a hole before that's alright.