Materials:

• White vinegar(in the water bottle)
• Paper for funnel
• Baking soda 
• Balloon
• Pieces of tape 

Directions:

1. Grab your sheet of paper and spiral it until you have a funnel that will fit into the balloon’s mouth. Tape the spiraled side of the paper to the paper so the paper funnel will stay. 
2. Carefully, pour the baking soda using your funnel into the balloon. 
3. After that, attach the balloon to the water bottle. Be careful not to spill the baking soda into the water bottle. 
4. Lift the balloon and let the baking soda and white vinegar mix!
5. Watch as the acid-base reaction causes the balloon to fill up!