What I do is take a smallish tupperware-type container with a snap on lid. Fold a paper towel and set it in the container. Put a little tad tea in it so the paper towel is good and wet. Place the petri dish on top of the paper towel and mist with tad tea. (Just don't cover the eggs with tea!) Snap on the lid. My container also has a few small air holes to help with circulation. If the lid of the container stays damp...you did it right.