I've been drinking quite a bit, and at a fairly heavy concentration, but just recently when I made it - it didn't taste like mud! I was so excited! I mean, that's the measurement of it tasting good - how NOT BAD it tastes. I don't think I would ever drink it at medicinal levels for the taste. I bought several pounds loose. Here's what I did.
1 quart of hot water
1/4 cup of RRL
1/4 cup of Nettle leaf
1-2 bags of peppermint tea (depending how strong the tea tastes)
1 tbsp of honey (stevia would probably work fine too - I've never had it).
I refrigerate and serve cold. Also it tasted best when I last made it and that time, I made a gallon. The yield though, for me, is if I start with a gallon of water I end up with 3 quarts of tea (soaks into the tea and evaporates, is my guess). I drink about 3-4 cups (by volume) a day. If you cut it in half with cold water/ice, it really doesn't taste half bad! I mean, it's no pomegranate lemonade, but it gets the job done.
For me, the peppermint tea is what really cuts the taste - I dislike it with lemon. That's just me though.
ETA: The only reservation I would have about mixing it with black tea is the caffeine content, which (I would think) preclude drinking it in the afternoon/evening.
PS at this concentration I DO have BH ctx come on and I'm sure it's due to the tea. I don't really get them otherwise. So bear in mind.