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I think the water that condenses in a dehumidifier is technically distilled, although in practice that probably depends on how clean your dehumidifier innards are.
brokenbetty-
From the limited amount I've discussed it with him it's a simple enough process but you need to have a fair bit of room if you want to distill industrial quantities. They do also test the purity in terms of ppm (particles per million). From the sound of it the discovery that this worked was a revolution in the window cleaning industry, especially in C. London.
Airhead
Our window cleaner used to distill his own! Apparently there are places you can buy it on tap (like garages). Pet shops also sell it in fairly large amounts. Not sure how expensive it is but I usually get some from the window cleaner to for a record cleaning machine.
I'm not sure about other methods. When I'm cleaning glass after painting etc. I use a window cleaning solution but I'm either on scaffolding or ground level or the piece is on the workshop bench so no need for a long range solution.