|L-R: Eyebright, Peppermint and Mugwort|
The three main ingredients in this version of Diviner's Tea are: eyebright, peppermint, and mugwort. You mix them in equal proportions into a tea steeper of your choice, and let it sit in very hot water for 3-5 minutes. Mix with your preferred sweetener (if you like one) and you're good to go!
The peppermint is mainly used to impart a lovely flavor (mugwort and eyebright aren't bad tasting but also aren't really amazing on their own). Thus you are welcome to replace peppermint with green or black tea to serve as a base as well. As for where to purchase such herbs, I've acquired the herbs in this photo quite inexpensively from a local metaphysical shop, but you may also find them online if you happen to live in an area that doesn't have them readily available.
I've brewed this combination only once, and it was very nice with a bit of honey. I've heard that it's particularly good for diviners sitting at fairs or festivals for a long day of readings, but it would be good at any time at all.