It is probably best to do cold water extraction with shrooms because the indole compounds are very volatile and sensitive to heat. So soaking the shrooms in water in the refrigerator for a few days might be better. I'd probably eat the plant material as well as drink the cold water extraction. Shrooms have been analyzed and the results show that the longer you let them dry out the less potent they become because the good compounds slowly evaporate off. So remeber store your mushrooms in the freezer.