Instructables
Picture of rain water filter
this is my entry into the Eco-tech challenge. what i have made is a simple filter that will clean rain water. its quick and efficient. 
 
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Step 1: You will need!

1x plastic cup 
3x chopstick
1x plastic funnel
1x packet of water purification tablets
1x towel
1x rubber band 

a pair of scissors 
pen

Step 2: Cut the bottom off the cup!

Picture of cut the bottom off the cup!
cut the bottom off the plastic cup with the scissors. you should now be able to see through the cup like it is a tube.

Step 3: Cut the towel!

Picture of cut the towel!
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cut a circle of the towel so it is just bigger than the rim of the plastic cup.
secure in place with a rubber band.

Step 4: Add the legs!

Picture of add the legs!
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attach the chop sticks as legs. slide them under the rubber band and adjust so it is high enough for a cup to fit under it ( pix no. 3)

Step 5: Add the purification tablets!

Picture of add the purification tablets!
place the purification tablet onto the cloth try to spread them evenly.
{ i did not have any tablets in the house at the time of build so in the picture i have used blu tac to demon straight.}

Step 6: Place the funnel in the top of the cup!

Picture of place the funnel in the top of the cup!
gently place the funnel in the top of the cup.

you have now FINISHED!

place in the rain for some clean water

Step 7: How it works!

Picture of How it works!
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as the rain is collected by the funnel it drips into the cup where it passes through the layer of purification tablets i then slowly goes through the cloth witch keeps out twigs and bugs then it drips into the cup placed under the dripping water.