Cooler tips - Free ice and keeping food/drinks cold longer

I've been making my own 20 lb blocks of ice in a plastic battery box for a couple of years, it takes about 3 days to freeze in my refrigerators freezer. Even in the Florida summer weather I have a little ice left after a 4 day camp-out. I use an old Igloo cooler and an insulated plastic blanket on top of the food. As the food, drink and ice level goes down in the cooler the blanket keeps the air space over the stuff in the cooler to a minimum. The blanket is the size of the coolers width and length, It has a vinyl cover and is has 1/2" thick foil-bubble-foil insulation inside. So far the milk as never spoiled.
I lived on a sailboat for quite a while without refrigeration, just an ice box. Block ice lasts about twice as long as crushed or cubes, the insulating blanket seemed to add about 25-30% more life to the ice. I found my ice-box blanket in a sailing magazine ad several years ago.

I lived on a sailboat for quite a while without refrigeration, just an ice box. Block ice lasts about twice as long as crushed or cubes, the insulating blanket seemed to add about 25-30% more life to the ice. I found my ice-box blanket in a sailing magazine ad several years ago.