Get a houseboat
Zombies can't swim so living at sea would be recommended.
Load up on food to start
Mostly fruit to avoid scurvy. Vegetables and meat can be found at sea.
Load up on supplies
Engine fuel, fishing rod(s), knife, desalination devices (for water), scuba gear (for seaweed gathering), a gun with a few extra magazines (for hunting bigger fish), wood planks (for breaches).
When you live on the ocean with nothing to do but survive off what nature provides, bring entertainment. The best forms of entertainment include games, books, and toys.
Bring a partner
Humans are social animals; without contact with other humans, there is no point in living. Be willing to accept having to split your catches of fish.