Just recently I entered a post about a bottled water design project in Australia that was aimed at aiding underdeveloped areas. And here is another very similar one, from designer Je Sumg Park:
Approximately 50ml out of every 500ml bottle. The rest is collected and sent to countries that have the little-helped but terrible problem of a lack of clean water. Along the top of the bottle (the place where the water’s obviously missing) has graphics that tell the tale. To notify the consumer, ideally to get them to join in on helping further than the bottle.
50 ml is obviously not something that would help, but this is a good idea to draw some attention to the problem.
Zalim 
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[...] posted a couple of news whith interesting design for bottled water, one of which was missing some volume to share with dry lands, while another one’s (Water For Water) profit [...]
[...] already posted several ideas just recently (see Water Bobble with filter, 90% filled water bottle designed by Je Sung Park and Water for Water from Australia). And here comes another one: 321 [...]