I recently bought an AquaRain Water purifier. It is not distilled (and that is what you asked about) but I am not convinced that distilled water is the way to go. This system uses no electricity which I liked. It sits on your counter and the water is gravity fed through 4 filters. It may not be what you are looking for, but you could check it out if you want to.
I don't have the web site handy, but just do a search for AquaRain.