put it in the fridge or freezer.
put the food in a plastic bag, zip it up, put the plastic bag in another big plastic bag and put the ice water in the bigger plastic bag. this keeps it cold until the ice melts.
the bag gets cold and keeps the coldness inside it
Well I had an ice cream stand this summer and didn't have a freezer so I put ice in my wagon and put a bunch of umbrellas on top and poured cold water on toip of them and suprisingly it actually kept the ice cream cold the whole entire day!
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.
The purpose of a food saver bag is to keep the food fresh. If your in a cold climate area than if you have a food saver bag than it will keep your soup warm instead of getting cold.
ice...dry ice...
An icebox is a type of refrigerator. It is a chilled box that is used to keep things cold. Ice boxes are kept cold with large blocks of ice that keep the food cold.
A freezer
Ice..
by putting it in the freezer...that makes it freeze and get cold...
put them in cold water
Put ice in it, or refrigerate it.