If I am late getting on the train, perhaps someone else can bring the Rhubarb Tea. Here is the recipe, it makes 2 quarts:
8 stalks rhubarb, cut into 2" pieces
8 cups water
Bring the first two ingredients to a boil then simmer for at least an hour. Let cool and strain. The add you favorite sweeter to taste. Serve iced. You can also garnish with something like mint, my favorite is Pineapple Sage.