What is a good material to make my own thermos out of?(GRADE 7)NO scientific equipmentI?

Answer 1

I would suggest you go to the store and buy a bottle of water. Drink the water and use the bottle. Take a block of styrofoam and carve out a space that you can place the empty water bottle in. Put the waterbottle in the styrofoam and then use some of the stuff you carved out to pack the bottle down good and tight. You might mix the styrofoam giblits with glue so that they will stay.
Or you can take the empty water bottle and wrap it in a layer of foam with a layer of aluminum foil outside the foam.