Nourishing Herbal Infusions are something I drink every day. A large amount of herb is used - 1 weighed ounce (different than a volume measurement) per 32 fluid ounces boiling water - and the herb is extracted for at least 4 hours. I usually extract overnight for simplicity. The herbs used are nutritional, tonifying herbs. They are full of minerals, vitamins, and other phytonutrients, and I use them as a multivitamin. I like to call them herbal gatorade for they contain electrolytes, except no glucose. They are my guarantee I will get necessary nutrients even if I'm unable to get my 5-7 cups of cooked vegetables in daily. I rotate through the basic herbs - Nettle leaf, Red Clover blossoms, Linden flowers, Oat Straw, and Comfrey leaf (NOT ROOT). I also add in a special herb to the rotation sometimes - Chick weed herb, Mullein leaf, Astragalus root, Raspberry leaf, Hawthorn leaf and flower are just some of the additional plants useful for making a nourishing herbal infusion. Don't make with strong smelling plants like Peppermint. These herbs are meant for teas, using 1 tsp or so per cup and not brewing for more than 15 minutes.
Here is a website dedicated to Nourishing Herbal Infusions: http://nourishingherbalinfusions.com/. I get all my herbs at https://www.frontiercoop.com/ through a wholesale account (sign up for $10!) or you can get them locally at Orchard Holistic Medicine (in small amounts), Marlene's in Tacoma, or Kitsap Clinic Supplement shop in Bremerton.
Amazon is also a source. These are affiliate links which I get a small payment if you choose to buy through these clicks: