A clear bottle. I used a smooth one.
Some sand from the beach. (You should rinse it first. I made the mistake of not rinsing it.)
Some tiny shells and rocks.
First, rinse your sand and put it in the bottle. Add your shells or rocks. In a bowl, dye about 3 cups of water a light bluish green with food coloring. Pour this into the bottle, filling halfway full. Add your glitter. I only had embossing glitter, so mine looks extra fantastical. Fill the rest of the bottle with the baby oil, leaving as little air in the bottle as possible. Now put some hot glue on the inside of the bottle cap and screw on tightly. Done! Now tip it back and forth and watch your own ocean swirl around and settle. Pretty cool!