I purchased the "Denatured Alcohol" in place of Ethyl Alcohol. I was told that "Denatured Alcohol" was also known as Denatured Ethyl Alcohol and that Denatured simply meant that something else had been added to prevent people from drinking it (without getting really sick). In my case less than 4% Methanol was added.
As for the router bit, there are a couple of places. I order mine from Hartlauer Router Bits, but Woodcraft also sells them. I've got a Woodcraft store here in my city, so you may want to check yours. You can also mail order from them. Here's the link to the exact bit:
