This looks like a really interesting development from South Africa. It’s a water filter that consists of a re-usable bottle and a replaceable, tea bag-like filter containing carbon and antimacrobial fibers that costs around half a US cent.
If it gains the necessary approvals this product is expected to make it onto the market by the end of this year and then field trials would determine its viability in the field. A key concern is that the system will require a continuous supply of filters and how would these get to remote areas? ColaLife, if successful, might be able to help out here.
This was spotted here on Treehugger.com who also provided some useful links to other possible drinking water solutions for Africa: