As cold water is absorbed faster than warm I'd suggest a small modification to this tip - add some water to the bottle first - then top it up when you take it out for the workout - instant ice pack inside that will thaw out during your workout on or off water. Depending on the length of your workout and the temperature where you'll be exercising you can modify how much water to freeze inside the bottle.
The same site includes an article with ten tips to help workout recovery.
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