http://www.youtube.com/v/1IwAdICoBl0This 40 ounce stainless steel water bottle has a secret dry storage compartment which can be used to store chlorine bleach, iodine or other water purification means. I use the dry storage for Chaga tea. I suppose it could be used to store dry tinder for starting fire in an emergency.
Somehow that seems a bit ironic, using your water bottle to store means of SureFire, maybe Wetfire cubes. LOL! Nevertheless, it could be done, as the compartment is fairly airtight and waterproof.