Creating a water filter

  1. Cut a clean bottle into half. Use the part which has the bottle cap.
  1. Place a cotton ball, cloth or a coffee filter as the first layer.
  1. The first layer should be about one to two inches thick
  1. Add an inch of activated charcoal as the second layer on top of the cotton layer.
  1. Over the charcoal add an inch or two layer of sand
  1. Over the sand add about two inches of gravel or small stones as the fourth layer.