Things You'll Need
Instructions
Buy a clear plastic bottle with a lid that will screw on tightly.
Cover half of the bottle lengthwise with a sheet of foam by gluing on the foam.
Fill 1/3 of the bottle with water.
Add blue food coloring one drop at a time until the water is the color you would like.
Add mineral oil to the mixture. Fill the bottle with mineral oil until the consistency reaches the rim of the bottle.
Wrap plumber's tape around the area of the bottle where you will secure the lid. These are called bottle threads.
Place the lid on the bottle and secure tightly.