ice
Keep in the refrigerator or if u want it REALLY cold try freezing it
Hot water pipes are made of different material so that they can keep the water flowing through them at a hotter temperature. Hot water pipes are usually made of copper or some other heat conductive material, and cold pipes are usually made of plastic or other non conductive material.
Metalic cups keeps the water cold and it can be also used to keep the water hot .
They are commonly made of a neoprene material or a neoprene and rubber material and are made specifically for triathlon events .They will keep you warm when swimming in cold water.
No however it depends on the material. Picture your clothes soaked in water. Obviously they sink but it would not stop you from sinking really.
A coat is a clothing material that you wear outside on cold days to protect your body from the cold and keep you warm
well not really because fish cant do that but yes only for a little bit
Ice..
The water would have to be colder than the ice to keep it cold. That is not possible unless it is brine(salt water). Then ice at 32f could be cooled by brine at say 30f.
put them in cold water
take the ripcrd and keep it in hot water for 2-3 minutes and then take it out it would be soft and keep it in cold water and straighten it with ur hands. first straighten it and then keep it in cold water
3 to 5 days.