Supplies:
  1. 12 or 16 ounce empty plastic bottle
  2. Any inexpensive vegetable oil
  3. Food coloring
  4. Alka-Seltzer tablet
  5. Water
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Setup: 

1. Begin by filling up your bottle a third of the way with water.
2. Then add a TON of food coloring so the water becomes nice and dark in color.
3. Fill up the remainder of the bottle with vegetable oil.
4. Finally, break your Alka-Seltzer into little pieces (into four parts works well).

How to Play: 

Now for the fun!
1. Drop one piece of Alka-Seltzer at a time into the bottle. Do you see all the bubbly action?
2. Wait to drop the next one until the bubbles from the first one have subsided.

Indoor/Outdoor: 
Either