A little late on this, but I'll throw my input in.
So, my suggestion is to get a small water chiller. Hook it up to the heat exchanger and feed throat. It will circulate water for you, and have a water sample sent out, they can tell you what exactly is in your water, from there get some pricing on chemicals to counteract anything that is in the water to keep your machine clean. It's a closed loop system, so you wouldn't have to worry about keeping the water tank full or anything.
For the mold, depending on what materials you run, you can use the chilled water on the mold. If you're running nylon, ABS, or anything like that, that's when you need heated water.
If you need any more help, feel free to email me.
Mitchell Parker
Parker Precision Molding, Inc.
mparker@parkerprecisionmolding.com