[nawitus]

Hmm, $40 million to 'benefit' 2.5 million water. That statistic doesn't exactly state if those 2.5 million now have access to clean water. However assuming that, then the charity can provide access to clean water for $16/person. Assuming furthermore that it'll cost the same amount to give water to the remaining 800 million people, it should cost about $12.8 billion to give access to clean water to everyone.

The total foreign aid per year is more than $100 billion, so using effective foreign aid access to water could be solved easily. Unfortunately, foreign aid is extremely inefficient.