Can you cool a liquid while not defrayal any energy ? Scientifically no, however much affirmative ! Let Pine Tree State introduce you to the science that dates back to Indus natural depression civilization - state change Cooling.
“Matki” in Hindi or “Paanai” in Tamil, incessantly transfers heat from the water through those minute pores to the atmosphere, resulting in evaporation (by losing heat energy) and thereby cooling down the water temperature within the pot. This makes the water stay at a nice temperature while not electricity even throughout ‘Hot summer days’.
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Remember, the summer in India sometimes ranges anyplace from thirty five ~ fifty deg C. Keeping water cold at these hot temperatures while not electricity, is certainly not possible. Well, that’s another INDIAN JUGAAD for you !