Chill Factor CF001402-US Color Change Rapid Chill Drink Bottle, 20 oz, Blue Pour in water or any room temperature drink, it will be cold after few seconds and stay cold for up to 4 hours. The new hyper color function shows how cool your bottle is Take me home and put the water bag into the freezer. That's where I live. After frozen, add the Polar pack to the bottle and pour in your favorite drink Non-toxic and BPA free