Easiest way which I have had used in the past with a 50 foot garden hose.

Stretch your charged garden hose out on the lawn, patio or driveway and leave in the hot sun for an hour. That water in the hose will be plenty warm to have a quick shower /wipe down with.

Of course, a longer garden hose helps with much more warm water to use.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock