By 1LT Chris Post
If the municipal water supply goes down in a catastrophic zombie outbreak, then you must purify your drinking water or risk death.
A number of commercially available filters and chemicals adequately treat water, but as desperate times stretch on indefinitely you may need to craft an improvised filtration system from commonly available materials.
To build a basic filter, you’ll need some cotton fabric (such as a t-shirt), a five-gallon bucket, sand, gravel, and crushed charcoal. Collect the charcoal from your campfire, making sure it’s roughly the size and consistency of gravel. Do not pulverize it into a powder.
First, make several small holes in the bottom of your bucket. Line the bottom of the bucket with the cotton fabric, and cover this with some of your gravel to a depth of about two inches. Next add another two inches of crushed charcoal. Cover this with another layer of cotton and add two inches of sand. This set-up should give you a filtration depth of approximately six inches.
Repeat the process to create a final filtration depth of about one foot.
Mount the bucket off the ground, allowing you to pour water in the top and collect it as it comes through the holes in the bottom. Finally, before drinking any filtered water, bring it to a rolling boil for at least five minutes.
Humans need a near-constant supply of clean drinking water to stay alive. Taking this fact for granted could mean certain death when the dead rise.