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Infrastructure is a lot more permanent than ad hoc solutions.

Not having the knowledge or equipment for drilling water wells is a problem. Getting the knowledge and the equipment there is another. The result is not a dependency—rather, the alleviation of a dependency.

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Exactly! What we are discussing here is an ad-hoc solution. That $4 device will work for how long? A week? A month? Then we're up for the next one. A continuous stream of aid is necessary to keep this solution going. So, it's not sustainable, assuming we don't consider permanent aid a sustainable solution. (I don't.)

I agree, it is not a primary solution. However, in a world increasingly plagued by natural disasters, well water can often become unusable, and in those disaster scenarios devices like these can save lives.

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