How do you make a thermos?

you might want to try this website out it really helped me, and its really good: http://www.thinkythings.org/carafe/build.html Hey,To Make a thermos is infact quite really easy. I had to make one to, to hold an icecube from melting. First find a container but make sure it is not a conducter of heat like metal. So Something like plastic would be fine. Then wrap the whole contanier with aluminum foil.Around that cover it with Duct Tape.Inside put about 4 peices of fibre glass found usully at homehardware. Also add ice packs and open them and use the materials inside. Put the lid on top and voila IM FOR SURE it will work. Good Luck:)