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How to take an ice bath
Buy a bag of ice from a grocery or convenience store.
Bags of ice are usually kept in freezers at the front or back of the store. Either buy the ice right before you plan to take your bath or store it in the freezer until you are ready.
Fill the bathtub halfway up with cold water. The ice will cause the water level to rise when you add it, so you do not want to fill the tub all the way up.