This is what you can do at home. You'll need water, food coloring, cooking oil, alka seltzer tablet, and a bottle.
Instructions:
1. Fill the bottle about half full of water and add a few drops of food coloring.
2. Fill the rest of the bottle with cooking oil and allow the components to settle and separate.
3. Break an Alka-Seltzer tablet into quarters, and drop one piece into the bottle. ...
4. Watch as the bottle swirls and churns like a real lava lamp!
