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Distillation
Distillation is a method that is relatively inexpensive, has no expendables other than glassware and heating elements, but is only able to produce Type II or Type III purity grade water. It is not an on-demand method so it has to be distilled and stored in advance of the need for it. If the storage container is not made of an inert material, plasticizers will leach out of it and recontaminate the water. Also it is highly wasteful of energy and water, wasting as much as 95% of the feedwater and leaving only about 5% as pure product.
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