Start making a list of the canned and packaged foods you like. Fresh food storage space is limited in many boats, and freezer space is almost non-existent. Canned veggies will prob. end up replacing fresh and frozen veggies.

Frozen meats may be a thing of the past. Get yourself a vacuum sealer, meats can be vacuum sealed and last much longer at temps under 60 degrees f. You can buy a slab or 5 of cured bacon, that does not require refrigeration. Same with Country Hams. Tuna, Salmon, chicken now comes in foil pouches, that don't need refrigeration.

Economy sided cans are out unless you have a way to store and use the leftovers before they go bad.

Learn to cook with raw ingredients, and not use many convenience packaged items. The raw ingredients can be used in many dishes, while "Hamburger Helper" is just basically that. Herbs and spices will add much flavor to your meals.

Think simple until you get to know your galley, and it's limitations.

A boat I'm looking at has a galley with a propane stove/oven near the main hatch (20 pound tank), with a 1 pound bottle propane grill off the stern rail. If I get it, I plan to hard plumb the bottle grill to the main propane system, and to add a 1 or 2 burner attachment to the grill, or have it somewhere in the cockpit near the stern. This should cut way down on cooking odors and grease buildup in the cabin.

I hope you like fresh fish. Catch and cook your own.

Do you plan on working? You might also want a mail drop of pick a berth in a marina that will hold your mail for you.

Wireless Internet is a way to go, many marinas have "Wi-Fi" on location. Laptops with several batteries may be very workable.