Other than using a freezer, what are the ways that you can make ice without machinery?
Making Ice With Fertilizer
You can make ice with fertilizer and water. Why it works: Ammonium nitrate (a chemical found in fertilizer)is a salt, which is made up of a 50/50 mixture of ammonium and nitrate nitrogen. When ammonium nitrate is mixed with equal parts water the ammonium nitrate dissolves into the water. The energy is absorbed from the water, which causes the temperature of the water to decrease and therefore freeze, creating ice. Here is what you do: Fill a bucket with equal parts water and ammonium nitrate(fertilizer) place a smaller metal bowl (you can’t use plastic as it is an insulator) half filled with water in the bucket and wait. The bowl of water will freeze and you have clean ice
You can just exploit any chemical reaction that is endothermic, as mentioned above, as it will absorb heat from the surrounding water.
