Sounds a bit iffy. I had a good friend that took all the backpacking recipes
we had and tried to do it as a business for outfitting long trips. It wasn't that great even though the food
was. I even started buying
my own food
there (with a bit of a discount) and it went along for a while then they sold it and probably a good thing too. Selling food just isn't a high margin business. Custom food gets to be intense work for low pay. Selling food advice is probably doomed out of the shoot unless you sell the food too. If you handle meat the FDA will kill you with red tape
and paper work. It's one of those times when being vegetarian could be healthy for business.
a boat is just where you live. It really isn't anything special as far as working for a living. There isn't some advantage that just comes to you because you want to live on a boat. Business is still business. Don't lose sight about that.
Last advice. Promoting a cruising business here is ill advised. It's OK to talk about stuff but trolling for business here gets you in trouble. Just so you don't get the wrong idea keeps it all friendly.