Tool using animal writes has a simple hydroponic system you can make with foam cups and easy to gather supplies… – “This is a completely passive hydroponic float system suitable for fast growing crops in cool weather..” – Link.
From the pages @ MAKE:
Home Mycology Lab – Use an off-the-shelf home air purifier to make a laminar flow hood for your own miniature mycology lab. Then use it to culture and grow mushrooms, and to perform other experiments that require a clean-room environment. MAKE 07 – Page 102.