Energy efficient water purifier

The Grameen Bank has partnered with Dean Kamen of Segway for manufacturing and distributing an energy efficient water purifier. Kamen invented a really cheap method to purify water through distillation, where the purifier can be efficiently powered by a generator that can run on cowdung. At manufacturing and distribution costs of under $1000, this could really be a new tool to put into the hands of local entrepreneurs because the job does not end at just making good water, but safe storage and bottling of water is important. Value addition like carbonation to make cold drinks or squash can further be relevant.