Ice for your cooler

My family and I go camping for a week or more about three times a year. I am always trying to find shortcuts and good ideas. This is one that we made up. I freeze my drinking water in the jugs it comes in. (you may need to pour out a little water to allow for the extra volume when freezing.) before my family and I go camping. These go into my cooler as block ice. When it thaws we have cold drinking water. It does a double function by keeping the food cold and thaws much slower than crushed ice plus you are carrying your drinking water.