Abstract: A survival kit comprising, inter alia, a replacement cap for a conventional canteen, a gasket, and a collapsible tube. The cap includes a crown and an annular depending skirt; a passage is defined clear-through the crown and the skirt is internally screw threaded so that the cap can be secured to the threaded neck of a canteen. The gasket is a flat annular washer with a central aperture. The collapsible tube is formed of several telescoping sections and one end of the tube is threaded.When the survival kit is utilized to obtain potable water from salt water, contaminated water, vegetable matter, etc., the cap of the canteen is removed, and the collapsible tube is removed from the interior of the canteen. The gasket is positioned atop the neck of the canteen, and the replacement cap is secured thereover after partially filling the canteen. The collapsible tube is extended, and the threaded end thereof is secured within the aperture in the replacement cap.