I make fogjuice and I use de-ionized water and polypropoleneglycol.

If you need any let me know, I can sell it somewhat cheaply.

I sent some to Tam to experiment with but still have not heard back.

Be careful using Glycerine and water, alot of people who make home made fog juice use this because it's cheap, but at certain temps it will become very, very toxic.
So if your friend is using this mix and selling to the public, I hope he has good insurance.