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Make two boxes with thermocol,one is twice the dimension than the another box(Do not cover the top).Fill the mixture of rock salt and water in the large box.After that insert the small box in the large box(don't allow water to flow inside the small box).Then permanently close the gap(at the top) between the two boxes.Cover the joints with waxes.Now the gap between the big box & small box is filled by water and rock salt mixture and the top opening is closed.Now the box is look like a single box.Cover the top with a suitable size thermocol and put the box inside the freezer for 12 hours,after that take it out and used for store items.The box is ready.When the cooling is lost put it again in freezer for 12 hours.

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11y ago
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