I agree with @luzcypher's recommendation. My dad used a similar setup for several oyster mushroom kits, indoors in winter with dry central air, and had great success. The key seems to be a plastic tent to get the humidity in, but with enough air circulation so you don't get mold, and a passive way for the block to wick up water without being drowned in it. If you use water that has sat out a day or two, any chlorine will evaporate and not try to sterilize the mushrooms, lol. And leave room in the plastic tent for the mushrooms to really grow. Have fun -- and report back to the @gardening-trail! ; )