Make tea as you normally would for drinking.
Bring to a boil, turn off the heat, and let the herbs infuse for 1 hour with the lid on the pot. Now you have a huge pot of tea.
Leave the herbs in the water for the foot bath or strain them out. (I like to leave the herbs in, as they continue to infuse into the water and I enjoy their color and texture.)
Reheat to the perfect temperature just before using.
Pour the strained or unstrained tea into a foot basin or a large pot.
Soak your feet for 10 minutes or for as long as you like.
When you are finished, just pour the water and herbs into a garden bed outside.