Pick a weight measurement, say, 1 oz. and use that for each "part." Blend together and keep in a big bag or a glass jar. Since it's dry, I just use a bag
Put a big handful into a pot of cold, filtered water to brew. (I'd estimate I use about 3/4 c. for a half gallon).
Bring it to a boil, then shut it off and let it steep for a few hours.
Strain, discard the herbs, and sweeten lightly if desired. I like to add 1 - 2 tbsp. of raw honey per half gallon.