Wall of text incoming!
Well, for a start, anyone who thinks they will have more bullets then zombies is delusional.
Now that that is out of the way. I don't think that real zombies will have that 'pack' mentality and/or collective conscience that various media hypes up.
The mental stability aside, with an able body as well as calm and thorough thinking, you should be able to last quite a while.
As for supplies, non-perishable food, that is incredibly easy as at least half the things you would see on a supermarket shelf would last for months if not years unopened. Water is significantly harder to keep on the other hand, if it is not factory-purified it will likely stagnate. And would you -really- trust most open even tap water if it could spread whatever is eating the zombies? (Bad pun intended) =3
Weapons and survival... Guns? Ha! Couple of dozen bullets will do what? Kill a handful of them? Whoop-de-do. Lets be more realistic here, not everyone has or can get access to firearms, and without stockpiles of ammo they are useless at best. Sword and a decent outfit that is bite/scratch resistant? Better choice. Will you likely have a Sword? Doubtful. What else can you use? -Anything- Something long and blunt is good, Long and pointed is better, Long and bladed is better still. Just keep in mind that you will probably only need to actually kill zombies infrequently, mainly if you need to slink around for supplies and to see whats going on.
In short, will everyone survive? Heck no.
Will quite a few? Probably.
/endrant, wallotext crits you for over 9000 =3