Make sure to put the potting soil at the bottom of the CD case where the opening is at the top of the case. I did put a little tape around the bottom to keep the case closed and to make sure that water didn't get out so easily when we watered it. We used a small dropper to fill water and put the water through the opening at the top of the CD case.
We found an observation sheet to fill out here so they could record the changes everyday.
And just watch it grow! We aren't totally finished watching ours, but when we are finished we plan on taking a sharpie and labeling our plant on the CD case starting with the roots and going up. The girls have done very well at making sure its watered everyday. They look forward to it.