Originally Posted by B4otter
Almost all of the newer, high end coolers have drain fittings that accept a regular old garden hose connection - so you can easily access without lifting the cooler up and out by fitting a short extension. All cooler threads return "to drain or not to drain" eventually...!
The reason radiators/air conditioners use a liquid medium is to more efficiently convey heat/cold.
Leaving water within ones cooler will also do this transfer faster.
That means your cooler will loose its ice faster if you leave water in.
Your beer will get colder quicker.
A preferred option is to place your ice in a container and drain that sterile drinking water. Maintain fluids in your body, not your cooler.
One can freeze some of your milk and juice in jugs with space provided for expansion. In addition to frozen foods.
Try using a container like this iced up:
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Now. If you're on a short trip and a specific cooler is beer friendly. Don't drain but do have one or two drops of chlorine added each day.