Do you have to use a full bottle of soda make Mentos shoot at least 6 feet in the air?

It is not necessary to use an entire bottle of soda to make Mentos shoot at least 6 feet in the air. The reaction between Mentos and soda is caused by the presence of gelatin and gum arabic in the Mentos, which act as nucleation agents for the carbon dioxide gas in the soda. This reaction can occur with just a small amount of soda, and the height to which the Mentos are propelled depends on the pressure inside the bottle and the amount of soda used. Using a full bottle of soda will generally produce a more powerful reaction, but it is not essential for achieving a 6-foot height.