How can I make a simple water filter?

LEVEL: Intermediate / Secondary

If you do a search on Google for the keywords "water filter" +making, you will find some useful sites.  Have a look for those that include activities or words like "how to make".

HOT TIP:  by putting your keyphrase "water filter" in speech marks the search results will have those two words together as a phrase.  And putting + in front of the keyword making means that word must be included in the results.  This helps to make the results more relevant to what you are looking for.