Clean the mushrooms and prepare them for adding to the water. Allow it to simmer until it releases the active components of medicinal plants in hot water. Then, boil the water and then allow it to simmer before adding birch polypore. The tea made from birch polypore can be consumed or stored to use later. The tea should be simmered for about 15-20 mins. If it is simmered for more than that, the tea becomes too bitter.