Hydroponic Gardening Science Project

Soil water versus the growth of plants?
My daughter is starting a science fair project. She intends to prove that plants grow better soil or water. My main question is: Where can I find good instructions on setting up a hydroponic garden? We have done some research online, but since all the instructions seem to be complicated, and I want to make sure that this is a project that she can control. Your level of education is the fourth grade and she will have one month to complete your experience. All suggestions and help would be greatly appreciated. Thank you.
% Http: / / www.home-garden-rewardpath.com/rd_p?p=104136&t=3085&c=542013&gift=24660&a=24660-hydroponics 20kits Sorry this was the best I could find
Research and Develop It Yourself (R&D-IY): The Windowfarms Project