Water Bottle Cheat

1. Get a water bottle and very carefully remove the label/wrapper that wraps around the middle of the bottle.
2. If it is thick enough, write your cheat-sheet/notes on the back of the label (the white part that sticks to the bottle) or attach the label to a sheet of thin paper with a glue stick or tape.
3. Re-attach the label to the bottle.
4. Look through the bottle at just the right angle, and you will be able to read your notes through the clear water within.