Question on types of insulation?

I'm looking for a relatively cheap thermal insulation material/ chemical preferably suitable for use near food and drink. It needs to be as effective as possible at keeping heat in. Possibly close to the thermal insulation power of a vacuum flask?

Answer:
your best best is isocyanurate. The easiest way to get it is at home depot. It comes in cans. It is commonly called expanding foam. Don't buy the water based stuff, it is worthless. There is the minimally and maximum exxpanding type (red or blue cans) Hilti also make it but it is more expensive. It should cost between $5 and $9 per can.

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