I've been reducing with homemade reducer. It's easy to make and all the ingredients are easy to get (all at Walmart.) It's suppose to work the same as the stuff you buy. I can't take credit for this I fount it a while back on an airbrush site. It's also here on this guys siteMy link
Here is the ingredients
* 3 parts Distilled Water
* 1 part Denatured Alcohol
* 1 part Ammonia Free Window Cleaner (Clear is best)
* Drops of Glycerin