I Googled and remembered. He said it was paint but Google says synthetic textiles and tires. But paint is super high too. But you can’t really avoid clothes, tires, and paints… tea bags maybe. Can’t avoid plastic yogurt containers either. There are no other options AFAIK.
It's pretty easy, though. I make mine in half-pint jars. I usually make about 14 jars at a time when I do.