I would say fish :-) Joking aside, of course he can eat anything he wants, as he can perhaps bike to the grocery store nearest to the shore. I guess living in a boat is like living in a water-front property that has better view than other water-front properties.

There is something really cool about torrenting recent Johnny Depp movies using a Swedish website while you are sailing.

Right, except I have a small dinghy so I can sail to the grocery store :-)

There are fishermen on the harbour, so I do actually eat quite a bot of fish.