Is there a way to turn hot water instantly to cold water? Is there some sort of chemical reaction or element that allows this process to happen?
closed as unclear what you're asking by Mithoron, Tyberius, a-cyclohexane-molecule, Jon Custer, A.K. Nov 26 '18 at 17:43
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If you put a strongly endothermic reaction in a water bath, or put something extremely cool near or through it (dry ice, liquid nitrogen, etc. like @iad22agp said), then it would cool down.
One thing to note is that water has an extremely high heat capacity compared to most substances, so it takes a considerable amount of energy to turn "hot" water to "cold" water.