2. Cut a circular piece of plastic canvas so it could be inserted inside and glued.
a. About 1" into the bottle.
b. Used that new gorilla super glue. It is thick and dry's rubbery.
3. Rotated the bottle with the glue in it to evenly coat edge of plastic canvas.4. Let it dry over night on it's side so the glue does not run down the bottle and keep rotating.
5. Next cut out the bottom of the bottle you cut off.
6. Leave a lip to hold another circular piece of plastic canvas and glue it into the bottom piece.
7. Then silicone the bottom back on.
8. I think tumblers have two bottoms so fish don't pick at the eggs.
9. Drill 15 small holes in the cap.
10. Drill two holes on side so you can put suction cups on.
11. Drill 1 more hole where you insert the air hose in neck and tie wrap it.