Can we use plants to clean our water? [idea]

 Cucumbers, Water Melons, Citrus Fruits, Coconut are classic examples where water is a major part of them. We are very happy and feel safe to have these wonderful natural powerhouse foods.

Do you think we can learn how this plants/trees filter water and make it wonderful for us? 

Then we can imagine the wonderful world of good water all around us.

What do you think?