Our solution was a Portable Refrigerator Freezer from WAECO. It can be a freezer or a fridge, and runs on DC or AC. Once it is cooled down power requirements are pretty low. In the past we tried dry ice, blocks of ice, and blocks of ice with salt. Now we just use the WECO without all the hassle. My second choice would be a very well insulated ice box with blocks of ice. You still need to carry food that does not require refrigeration. Many things can last a long time. Eggs can be kept for weeks by turning them and keeping them in as cool as possible a place on the boat. You need to test them for gas build up by checking to make sure they don't float in water. Good eggs sink. Most supermarkets sell the milk that does not need refrigeration until it is opened. If you buy the more expensive smaller cartons, you don't need refrigeration for that either, since you use what you open.
Last edited: