What is the ultimate apocalypse vehicle?

[Evan]

nuke sub is designed to be self sufficient for months at a time, even years if necessary with a minimal crew.
food and water is unlimited at sea, unlimited power, I fail to see the issue. Military over-engineering means shit doesnt break.
The backup plan, which is probably more realistic is a nice big sailboat with a solar array and a bunch of guns.

Anything on land and any gas guzzler and you are fighting Mel Gibson for gas and water. Have fun with that!