Here are a couple of characters that would get you to last a long time
Captain America his shield would be a very valuable to take out zombies and any evil people that try to take over
Green Arrow can pick up his arrows after he shoots them
Beast, could work on a cure
Colossus would be good because when he is in steel form couldn't be turned.
Deadpool or Wolverine would be better if the healing factor prevents them from turning.
Have fun getting the attention of thousands of zombies