This Single Wall Stainless Steel Bottle isn't merely crack-proof and crush resistant, but it's a hidden benefit: It may be used to boil water to ensure it is more safe to drink.
However, before you get excited and begin repairing yourself a bud of campfire tea, then there has something that you ought to know.
The Stainless Steel Bottle should be of single-wall structure and made from stainless steel or a different fire-friendly metal (titanium is just one) with no coatings or paint. Do not place an insulated or double-wall jar at the flame. The warmth will not pass correctly, and the jar will probably burst. Forget the Alu. Water Bottle also, since the metallic as well as the coatings can liquefy bad things in your water when heated.