I'm not sure what your ...

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I'm not sure what your application is. For single use, emergency supply, there exist forward osmosis packs like these: http://www.htiwater.com/divisions/personal_hydration/index.html 

If you're looking for something that is low energy, low technology to provide a (relatively) small amount of water then perhaps a solar still will suit your needs?

What is your intended market? what is the required throughput? What are the constraints?