Abstract: A canteen especially useful in contaminated environments includes a hollow watertight container adapted to hold a quantity of a drinking fluid and a filter device extending into the container through an opening at the top. The filter device comprises an elongated tubular member having disposed therein an air filter for filtering the air entering the container and a water filter for filtering the drinking fluid exiting the container. In using the canteen, air is drawn into the container through the air filter and drinking fluid is drawn out from the container through the water filter by suction.

Abstract: An orally operable, portable, water filtration device. The device includes an elongated tube having an inlet end and an outlet end. The inlet end includes a screen whose openings are in the form of slits. The slits have a width of about 0.005.+-.0.003 inch and filter out pollutants of at least that size. The tube also has an integrally formed internal ledge onto which is disposed a porous polypropylene membrane having a pore size of about 5-8 microns. A bed of granulated activated carbon with a grind size of 1230 is disposed inside the tube between the inlet end and the porous polypropylene membrane in a 7:1 ratio (bed height:bed diameter). A mouthpiece, which has an inlet and an outlet, is mounted over the outlet end of the elongated tube so that the mouthpiece and the elongated tube are in fluid communication. To use the device, the inlet end of the tube is inserted into water and suction is applied to the outlet of the mouthpiece.

Abstract: A container assembly for holding a supply of drinking liquid includes a watertight container. A removable filter device extends into the container through an opening at the top. The filter device comprises an elongated cylindrical member having an inner wall divides the area inside of an upper chamber and a lower chamber and forms a sipping tube for accessing the lower chamber through the upper chamber water filter is disposed in the lower chamber. In using the container, air is drawn in through the upper chamber and drinking liquid is drawn out through the sipping straw by suction.