The tea mixture that I make is very plain and bland but I mostly use it for asthma and bronchitis so you don't need much of it or do I advice that you use much as any herb can have side effects and a little is better when trying a new herb. Also note that I was taught to use horsetail for external bleeding wounds, you moistion the horsetail or steep a concentrated mixture and apply to the wound and it stops bleeding. Note these are the things I was taught by my people the things I now have never been proven scientificly to me or what I have been taught by my father and grandfather. The name of shave grass/horsetail in my language is: "KEZIBSKOL" it's translation is Hissing Plant, Scouring Bushes, Horsetail.
I boil approximatly 1/4 ounce of horsetail in one quart of water and then steep for 10-minutes. You can add other things to better the taste I suppose what ever you might want, but keep in mind that I only recommend 1 tbl. to try it to see if you have any bad reactions to it and if not then I drink one cup a day while having respirtory problems.
I hope this helps.
Love & Happiness
Autumn
Disclamer: I am no way recommending anyone take any of my advice or even follow my recipe for the tea or wound healer. I am not a doctor, I am Native American and am just saying how I use "KEZIBSKOL" for my own use what I was taught by my people the Penobscots.