what you need to do is mix some clay with coffee grinds, mold it into a cylinder with one capped end, place it on a dung-heap and light the shit on fire. This "fires" the clay like a kiln. The coffee grinds get burned out leaving a structure of pores that are small enough to let water pass through, but too small for the passage of E.coli etc.
This is a low-tech, low-cost method of filtering water.
check out the link to where I read this:
H20 filter from scratch
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