Summarize the following:
You will be making a water filter that relies on layers to make dirty water clean. If you plan on drinking this water, you will need to boil it after you have filtered it. Here is a list of what you will need:  Plastic bottle with a cap Craft knife Hammer and nail Coffee filter Large cup or mug (Either one works) Activated charcoal Sand Gravel Container to catch the water (jar, cup, mug, etc)

Summary:
Gather your supplies.