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I was just thinking out loud and realized that my hot water tank holds like 80 gallons of potable water.
Portable Water Filters
One other type of homemade water filter is far more portable and personal. The materials for this style of water filter are readily available and can be found easily in most households.
A two-liter plastic water bottle with the lid will serve as the housing for the filtration system. An ordinary plastic straw will serve as the spout. The filtration system will consist of cotton batting, fine and large grain gravel, fine and large grain sand, and a coffee filter. Activated charcoal granules may be added for an extra level of filtration. The filtered water can be captured in a mug or jar.
To create this style of homemade water filter, cut off the bottom of the two-liter water bottle. Create a hole in the lid of the bottle so that a straw may fit snugly. The straw must sit half way through the opening in the lid. This housing configuration will sit on the jar or mug with the straw end of the housing inside the jar.
Place the cotton batting at the bottom of the two-liter bottle, this will serve as the lining for your filtration system. Start with a layer of activated charcoal granules.
Next, place a layer of fine grain sand followed by a layer of large grain sand. Follow the layers of sand with a layer of fine grain gravel then larger grain gravel.
Alternate these layers until you reach the top of the bottle.
Top the filtration system with the coffee filter. Once the filtration system is in place, pour in the unfiltered water through the coffee filter. The untreated water will work through the layers of sediment to wick away the impurities in the water. The cotton batting catches particulates from the sediment and acts as a final buffer. The filtered water will flow through the straw spout into the jar for drinking. Adding a couple of drops of chlorine can add another level of filtration to the process.