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This water filtration system uses the idea of groundwater purification to replenish water cheaply. A layer of pebbles, gravel, sand and cotton is put into a water bottle cut in half in that order, top to bottom. A picture of this system is shown on the website above

"...this is just a miniature model made in 5 minutes. the elaborate plan is really that after this process, it will be aerated, so that the aerobic bacterias can form and eat up the unremovable toxins, which also produces the biogas, it is removed, then exposed to extreme uv radiation, and boiled that kills those bacterias too." -http://www.instructables.com/id/The-Simple-water-purification-System/ -In the comments section from the creator of the article