Distilled water can be cheaply obtained if you have a condenser clothes dryer.(posted 8414 days ago)I had a very pleasant surprise after my wife convinced me that buying a expensive european clothesdryer was a good idea (I think it was a payback for the hassy kit). Anyway when the guy came to install it, he showed us how to work the dryer (it can do all kinds of amazing things) and he mentioned that the moisture is collected to prevent the house from steaming up.
Turns out that the "waste" water is distilled to a purity that it can be used in car batteries (or the home darkroom).
Now when I need to process some film, I put on a load of towels, get a couple of liters of distilled water and I'm away.