1. Decorate the plastic-dropper to look like a squid. Draw some eyes on the top of the dropper. Stick or wrap some tentacles made from balloons around the body.
2. Fill the cup with water. Fill the eye-dropper ½ - ¾ full with water from the cup, leaving room for a small air bubble. Place your Squidy in the glass of water to test that it floats. It should float with only a small section of the top of the plastic-dropper floating above the water line. If it doesn't float or it sits too high in the water, change the amount of water in the plastic-dropper and test it again.
3. Fill the clear plastic bottle with water. Place the plastic-dropper in the bottle, fill the bottle with water right up to the brim and then screw the lid on.
4. Squeeze the sides of the bottle and watch your Squidy sink. Release the sides of the bottle and watch Squidy rise to the top.
Note: If you turn the bottle up-side down the air bubble might escape and Squidy will not be able to rise again. If this happens, remove Squidy from the bottle and repeat Steps 2 to 4.