Sometimes I only have 10-15 minutes and I have a water bottle out, but it's near room temperature. I need it to be near freezing, but I don't have time to do anything.
Usually I will just put it in the freezer until I have to leave, but that usually doesn't do much. Is there any way that I can get a regular plastic water bottle near freezing temperature (or at least feel like it) in 10 to 15 minutes?
It would only have to be one water bottle at a time, and it would be great it the hack could work for Gatorade bottles too. The water must stay in the bottle (it's a hastle to get back in).
Always keep one bottle of water in the refrigerator (or freezer if you prefer a block of ice that will thaw throughout the day). When it's time to go somewhere, swap your room temperature bottle for the cold one.
Before you argue that it doesn't answer the question, remember this is LifeHacks SE not Physics SE. This takes less than 10 minutes, doesn't require you to remove the water from the bottle, and works with Gatorade.
Fill a bottle about half full and lay it on its side in the freezer with the neck tipped up just enough so that the water doesn't block it. Just before you leave take it out of the freezer and fill with water from the tap. While you're out the ice melts and cools the water. You could rotate bottles through the freezer so there's always one ready :)
We used to keep a container of very strong brine (water with a lot of salt dissolved in it) in the freezer for cooling beer bottles super quickly whenever The Thirst would strike. The brine could take a bottle from room temperature to freezing (we made a few beer slushies this way) in about 15 minutes. Problem was we didn't have a lid on the container and the salt water rusted out the door of the fridge.
Get some dry ice (solid carbon dioxide) or liquid nitrogen if you're cool. Dunk your water bottle into one of those for about 30 seconds for dry ice, 5 for liquid nitrogen. This will cool your bottle super-fast and even turn some of the water into ice. To increase the rate of heat transfer away from the bottle, cover pellets of dry ice with acetone. Acetone has a very low freezing point and can be purchased at most hardware stores.
How about the best of both worlds? Wrap the water bottle with salt-water soaked paper towel then put it in the freezer. Make sure to make as much contact between the water bottle and paper towel as possible.
The absolute fastest way is (as stated by mooseman) to submerge the water bottle in an iced salt water solution. If that is unavailable, the paper towel trick is next best.