Autofilling Humi for Walk In

How much water is this humidor going to require? It seems like it would have to be an awful lot before a distiller is going to pay off.

Just a thought but what about a tank that you can periodically fill with distilled water? I am picturing one of the the 5 gallon water reservoirs our caterers use with a spigot in the bottom. Remove the spigot and install a hose fitting. From there the system would be the same. A float level in the humidifiers reservoir controls a solenoid valve in the water line that runs from the water tank.

I did something similar a ways back. My boss wanted to have 'bathtub gin' served out of a real bathtub at a party. We ended up flying an old clawfoot tub 9 feet off of the ground. I stole one of those water reservoirs from the caterers and rigged it to some tubing and fittings I got from the building engineer. It all worked great except the punch the boss mixed up was pretty weak.