Water filters
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Instructions for making a water filter from gravel, sand, grass and a plastic bottle: [1]
See also Living Machines
UV LEDs can be used to kill pathogens and are cheap.
Slow sand filter with layers of fine sand at the top, coarse sand in the middle and gravel at the bottom.
According to research by Micha Hummler:
Original Plans from Josh Kearns and Aqueous Solutions: *http://www.aqsolutions.org/
Here is a $90 DIY water filter for purifying rainwater to drinking quality. Bill of materials and instructions are included (CC-SA license):