Ice Box Conservation
There's no real secret, Ken. Anything that can be frozen (meats, vegetables, etc.)are put into the icebox frozen. Beer and sodas are put into the icebox chilled. We use plenty of commercial blue ice containers and make sure the icebox is full or nearly so. We use 6 or 7 gallon jugs of water frozen to fill up the icebox if need be. We try to open the icebox only once a day, but probably average twice a day. In the morning, we take our full day's food and drinks out and put it/them in a separate cooler. I got one at West Marine advertised to keep ice for a week with outside temp of 90 degrees. This goes underneath the saloon table. I also use a separate six pack cooler for sodas, bottled water and ice cubes while sailing, so I don't open our daily cooler often.Using this regimen, the last gallon jug of water thaws completely around the 7th day, but the large icebox keeps things cool for a day or so longer.The only thing I replenish is ice cubes.The secret, if there is one, is to keep the large ice box closed and not rummage in it looking for drinks, snacks, etc.