then there is my friend Dan who finds an empty Pepsi can at the trailhead, cuts it in half or less with his small pocketknife plus puts a few vent holes in the side, uses a plastic squirt bottle with alcohol fuel, and heats up a lightweight titanium cup of water for tea or soup. Rather slow and will not suffice for spaghetti and meatballs, but he likes to tinker with shaving off every gram.