Instructables
This Water Filter is very easy and quick to make. Most, if not all the materials can be found in or around your house.   A Water Filter can be a necessary survival item if you have no access to clean water.

Materials Needed:

- Water Bottle
- Scissors or Knife
- Coffee Filter, Cotton Balls, or fabric.
- Sand or charcoal
- Gravel
- Large gravel or small rocks
- Cup to hold filtered and non-filtered water.
 
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Step 1:

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1) Using your scissors or knife, cut of the very end of the water bottle like so...

Step 2:

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2) Using your knife, scissors, or anything sharp, make a small hole in the center of the cap.  Make sure the cap is on tight!
In my case i used a small screwdriver and easily made a nice hole in the center.
A knife or scissors work just as well.

Step 3:

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3) Now stick your coffee filter (or cotton balls or fabric) through the hole and down by the cap.  You may have to cut the size of the coffee filter down to make it fit in the bottle.  I had to use a pen to push the coffee filter down to the bottom. 

Step 4:

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4) Now get your sand or crushed charcoal and fill up the bottle about 2 inches. 

Step 5:

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5) Next, add your gravel into the bottle. Around 2 inches of gravel should be enough.

Step 6:

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6) Finally add your larger gravel or small rocks into the bottle.  Again, 1-2 inches is enough. 
Your water filter is now complete!  Just put the filter over your cup for filtered water. 
With the other cup, pour the dirty/muddy water into the filter.

Step 7:

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Watch your dirty water come out filtered!  
Boil the filtered water to completely rid of all bacteria and such!
Enjoy!
topseyturvey!4 months ago

this is interesting! i might try it... BTW bioling water doesn't kill all the bacteria.

VadimS2 years ago
Neet, though just a warning. This will not remove bacteria (what's actually bad for you) just particles.
It's based on a slow sand filter, but it won't work as one.
antioch VadimS5 months ago

actually, with a regular supply of moisture, some beneficial bacteria will develop in the sand. to make use of these, there should be about 4-5 times more sand in the bottle in order to slow down the current.

VadimS antioch5 months ago

You're talking about a slow sand filter. Something the size of a 55 gallon drum would work.

Read step 7
SpencerrH (author)  VadimS2 years ago
yes, its just supposed to filter out leaves, sticks, small rocks, etc. so all you have to do is boil it.
Kiteman2 years ago
Congratulations on posting your first Instructable - have you seen the rewards you can get as a new author?
Housedog Kiteman5 months ago

This is what your links produces, Kiteman

"Sorry, we just can't find that one!"

Kiteman Housedog5 months ago
Try again, it works for me.
antioch Kiteman5 months ago

We're sorry, the URL is either incorrect or no longer available.
Maybe you are looking for one of the following Instructables below.

Kiteman antioch5 months ago

Ach, now it's working for me either. Sorry, folks.

same message.

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Must have just been taken down or only set up to be seen by pro memberships? I'm getting the same message.

samalert Kiteman5 months ago

i am pro member but still its not visible.

Error
Sorry, we just can't find that one!

Diamond Joe5 months ago
Awesome! I've been looking for something like this. One question; is there a limit to how many times this filter can be used before changing the coffee filter, gravel, etc?
jmwells5 months ago
After boiling you'll want to pour the water between two clean containers. Boiling takes out the dissolved oxygen. It leaves the water flat tasting. Sloshing it between containers puts oxygen back in.
sjohnson672 years ago
I really like this idea. I've made something like this out of bamboo, but the plastic bottle is great. You might want to start the first layer with grass, if you don't have cotton or a coffee filter. It will serve the same function. Also, sand helps to trap suspended particles. I would suggest using charcoal also (might need a larger bottle). Charcoal will help remove bacteria, including giardia. Top it all off with some more grass and a few rocks to hold it all down. Love the concept. +1