How to make a Water Filter
I got this from a wilderness survival blog. There are some typos, grammar issues, etc., but overall it is a good tutorial.
http://www.wilderness-survival-skill...er-filter.html
PS - If you don't have access to the plastic bottle or other container that the tutorial calls for, you can cut off the leg of your pants or the arm of your shirt/jacket and use it as the base for the filter. You will lose some water to leaks and evaporation, but it is beter than drinking nasty water.
Also, I would strongly reccommend adding a layer or two of charcoal to the filter to neutralize some of the nasty microorganisms that might be present.
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How to make a water filter
Knowing how to make a water filter is important, if the only water you can find is dirty muddy water. There are a number of different ways to make a water filter. One simple way is to use sand. Sand is nature's way of purifying water.
Simple sand water filter
1. To start with, you need a container. If you can find a large, empty can, use it. Punch 5-10 holes in the bottom of the can. A large plastic bottle is also fine. Cut the [bottom] end of the bottle off evenly. If there is no container available, you have to use what material that nature can provide, or that you brought with you.
If you find a birch tree, make a cone of birch bark. The cone will need to have a fairly small hole in the bottom. Tie the cone with rope to keep it from opening up.
2. First, you need to stop the sand to get out of the container.
Find some filter material you can place at the bottom. For instance:
• a couple of inches (centimeters) of pebbles.
• a grass mesh, make sure it’s nonpoisonous grass.
• or cotton material.
3. Add a layer of gravel. The main purpose of the gravel layer is to strengthen the filter material and prevent sand mixed with the water you get from the filter.
4. Fill your bottle or cone with sand.
5. Collect some water. Pour your collected water through the filter. Catch it in another container at the bottom. Look at the water that comes out of the filter. It should be clear. If not, you may have to pass the water through the filter more than once.
Safe water
Now you know how to make a water filter, but to get safe water to drink, you also have to purify your water. The water may still contain harmful bacteria that your filter did not remove.
To improve your water filter, add a layer of charcoal between the gravel and sand layer. Get charcoal from your fire, crush it, not to powder but just fine gravel size.
http://www.wilderness-survival-skill...aterfilter.jpg
