Article: Use scissors to cut the bottom off a 2 L (68  fl oz)  plastic bottle. Then remove a 3-in (7.3-cm) wide panel from one side of the bottle. The panel will extend from the cut off bottom to where the neck of the bottle begins to curve toward its spout. The plastic may be jagged where it was cut with scissors. Use medical tape along the cut edges of the bottle for padding. Poke breathing holes into the bottom of an aluminum can with scissors or a screwdriver. After that, cut off the top of the aluminum can with a sturdy pair of scissors, tin snips, or shears. Be careful when handling the cut metal of the can. It is often sharp enough to easily cause cuts. A layer of duct or medical tape can be used on sharp edges as padding. Insert a layer of cotton into the bottom of the can. Add a layer of activated charcoal on top of the cotton, then sandwich the charcoal with another layer of cotton on top. Tape cotton over the cut top of the can, then cut a small hole in the cotton. Use caution when loading the aluminum can with charcoal, especially if you decided not to pad its sharp edges with tape. Insert the spout of the 2 L (68  fl oz) bottle into the hole in the cotton at the top of the can. Tape the aluminum can to the 2 L (68  fl oz) bottle to complete the mask. By breathing through the spout, the air you breathe will be filtered by the charcoal in the can.
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Fashion a mask from a plastic 2 L (68  fl oz) bottle. Create a filter chamber with an aluminum can. Load the gas mask with activated charcoal. Tape together the gas mask and use it when necessary.