
I think I was supposed to give these to someone a month or so ago... If it was you, I apologise! Momma-brain!
Sitz can be made into sachets (herbs) or used to soak mama-pads (infused).
You want to look for an herb like comfrey.
The
Mothercare website has a few sitz bath recipes (click underlined link).
I like to infuse about 1/4 cup of dried comfrey leaf in 1 quart of boiling water. Let it cool, then soak some mama-pads in it for 1-2 hours. Wrap each one up and put it into the freezer, then mama can use them inside her underwear. Put a paper towel between the pad and her skin for added comfort while still allowing the comfrey to soak in well.
Alternatively, you can add this infusion to a shallow bath for mama to sit in, or wrap comfrey in a small organza sachet and add it to the warm bath water.
Another "sitz recipe" from an old issue of Mothering Magazine that is really, really simple can be found
here.
In "Childbearing Year", Susun Weed recommends using herbs like yarrow, rosemary, golden seal, oak bark, witch hazel, sea grate bark, and myrrh specifically for healing perineal tears. She also cautions that if you have stitches you should limit yourself to one sitz bath a day.
As for recovery soup, my postpartum menu is top secret, LOL!

Sorry! You can probably find something online that will hopefully suit your needs.