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.
