(Wait until the picture loads, it's quite big.)
I made one a couple of years ago at my Environment Class, it stood the test of time until it got lost.
Now I'd like to show you how I made a thermos out of two plastic bottles.
- When I made my thermos, I used a big 7-up bottle, and a bottle of either pepsi, or plain water.
- The more bags you put in between, the better it should work.