Best not to leave it sitting in water. Once it's soaked through let it drain out. After that mist it to keep it damp. There's a good possibility it's already dead, but if it isn't it could take a while to show signs of life. They have 2 types of leaves, The nest leaves surround the roots and rhizome. The fertile leaves stick out from the "nest". Are both types brown/dry or only the nest leaves?