In certain communities, access to watter is the key to survival, and thank to high design there is a more practical water transportation mechanism than buckets on heads. The Hippo Roller is nothing more than a barrel with a hollow center through which you place a harness and drag / pull it behind you. With curved shoulders it is ideal or traversing winding paths and unpaved roads. GOOD NEWS has a fantastic show on the development of the Roller.
This inspired me to look a bit further into water access and technology. I found an old Boing Boing post I remembered reading about using the power of play to drive wells. Seesaws and round abouts drive the pumping mechanisms, bringing valuable water to the surface and into holding tanks from aquifers in arid regions.
I also looked for and found a copy of a presentation by Alex Steffen from WorldChanging.org at POPTech! about sustainability. When i was there in 2006 and he had on display a Hippo Roller prototype! What was interesting was the way that the community at POPTech was so enamored with the idea of design and how it can make such an impact on the lives of so many that everyone at that meeting went back to their challenges with design in mind.