There are a few Instructables out there on how to create stills for various purposes. Usually these include a large amount of small diameter, flexible copper refrigerator tubing. While these stills can be quite effective, there is just something a little hokey about them. Especially the part where you run a large amount of expensive copper tubing through a bucket of standing water to cool the condensate. Then there's the issue of a high surface area on the interior of the tubing, which makes small volume distillations difficult to impossible. Plus they're bulky, unwieldy, and they look like a meth lab. I do have to give the authors of these projects some credit however, since DIY is typically about getting the job done, form follows function, etc etc. BUT...
I say there is a better way.
By using a small amount of 1/2" and 3/4" copper pipe, it is possible to build a lightweight, compact, collapsible, interchangeable, universal distillation apparatus for anything you could possibly hope to distill. The apparatus featured here is capable of efficient low to medium volume distillations and could in principle be scaled for use in high volume applications. It is constructed from relatively inexpensive parts which are available at any hardware store.
UPDATE 10/27/2011: If you find the start-up costs for this project to be prohibitive, I recommend this instructable.
I was inspired to build a distillation apparatus during an organic chemistry lab where we were required to identify an unknown organic solvent by IR spectroscopy. The samples they gave use weren't pure and we had to distill them first so the IR machine could get a good spectrum. This apparatus is modeled after the one I used in that lab. In the lab the apparatus was made of lab quality glassware. Since I don't know how to work with glass, and I DO have experience remodeling houses, I decided to combine my experiences to make an affordable, clean, safe, glass alternative distillation apparatus.
So. Now I've got your attention. Read on, my friend.