Sources used:

1.) http://www.sciencebob.com/experiments/fizzinflator.php
2.) http://www.wikihow.com/Make-a-Funnel-or-Cone-from-Paper
3.) http://www.science-house.org/CO2/activities/co2/balloon.html
4.)http://www.apple-cider-vinegar-benefits.com/baking-soda-and-vinegar.html

How to make your own paper funnel:

1.) Cut a circle out of a piece of paper.
2.) Cut a triangle by making two cuts to the center of the circle, The triangle should be one quarter of the circle.
3.) Fold the circle, overlapping the edges a little, and tape together.