kayell
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TrainChaser said:Those are just ceramic containers and they won't be cooler than the air temperature around them without putting ice in them. if the air temp is 95F, the water will be, too. Only when the water can ooze through the walls and evaporate will the contents be cooler.
The photos are a mix. You have to look for ones that are unglazed both inside and out. Those will cool well, 15 degrees F or more below ambient. Even better in a dry climate.
Another thing that will work is a steel walled container, wrapped in something porous (layers of cloth, batting, blanket, foam...) with the wrapping periodically kept wet and evaporating. On a small scale you'll see this in foam wrapped water bottles. Just avoid double walled containers. Those work well to keep already cold beverages cold, but don't allow for cooling. Give the foam a periodic dip.