what about putting your food reserves in a deep freezer then filling with water and freeze the whole thing? That way your food would last a lot longer. You would put your food you use first and then work your way down as the ice melted. The only draw back I can see you would need your food to be in sealed containers to keep the water out. Things that would not float like bags of rice or sealed cans would work. I bet if you kelp the door closed things would be ok up to a month at least. What do you all think would it work?