Abstract: A water purification device that can be inserted into a canteen full of impure water that allows a user to drink purified water directly from the canteen, without the need of a pump. The canteen insert is a multistage purification device that has an inlet section at one end and a canteen insert flange mouthpiece at the other end. After the present purification device has been inserted in the canteen, the user tips the bottom of the canteen upward, holding the flange mouthpiece to their mouth and squeezes gently on the sides of the canteen. This forced gravity action pushes water sequentially through the multiple purification sections of the preferred embodiment and subsequently out of the flange mouthpiece for consumption by the user. The canteen flange mouthpiece can also be replaced by a flute straw mouthpiece that allows the user to withdraw water from the canteen via the straw. The same multiple water purification stages are also used in a straw and an inline purifier embodiment.

Abstract: A water purification device that can be inserted into a canteen full of impure water that allows a user to drink purified water directly from the canteen, without the need of a pump. The canteen insert is a multistage purification device that has an inlet section at one end and a canteen insert flange mouthpiece at the other end. After the present purification device has been inserted in the canteen, the user tips the bottom of the canteen upward, holding the flange mouthpiece to their mouth and squeezes gently on the sides of the canteen. This forced gravity action pushes water sequentially through the multiple purification sections of the preferred embodiment and subsequently out of the flange mouthpiece for consumption by the user. The canteen flange mouthpiece can also be replaced by a flute straw mouthpiece that allows the user to withdraw water from the canteen via the straw. The same multiple water purification stages are also used in a straw and an inline purifier embodiment.