Question about how to make Dr. Christopher Eyebright formula

I've read several sites, and all it says it to use equal parts of the herbs and 1/8 part cayennes, and 'make a tea'. How much water do you use? How long do you let it steep?

I do not have the book, I'm sorry to say, and can't really afford to buy books right now, because I'm fighting a terrible parasite infection that has gotten into my eyes.