Full stacks of deer and boar meat, also stack of honey. That's my diet.
Portal materials are a must. so that's also wood, so also wood for chest.

There is very little one actually needs while exploring by sailing and I'm totally agreeing with

Originally posted by CPCEradan:

I have a workbench and a portal in the longship, another of each plus a chest on me, a full stack of each food I'm using, and that's all. If I need anything, I simply use a portal back to my base.