Okay, this experiment takes 6-10 days however the result is spectacular! I won't spoil it for you but the materials are easy and cheap to get if you don't have them. The correct scientific term for what you are doing with these materials is super-cooling or snap freezing which means that you keep water as a liquid, even below their freezing point.
Step 1: The Materials!
These materials as you recall are cheap and easy to get. The material that most people might not have is the thermometer and, or the distilled water. The materials that you will need are:
-thermometer (good range would be -10°C to 110°C)
-transparent plastic cups (tip: a tall, narrow shape works best)
-piece of cardboard (e.g., empty cereal box)