lizz you can just get one, and make the 2nd canister as a diy type of bottle, use a 2 way connector to join the 2 bottles and no need to spend another $26.
Heres the amount to use thats inside the packets
Stabilizer: 1 teaspoon Baking Soda
Activator: 1/8 teaspoon Active Dry Yeast
Sugar: 1/2 cup sugar
and for the diy if you use a 2L bottle then it would be
1.5-2 cups of sugar
1/4-1/2 teaspoons of yeast
1 teaspoon of baking soda
5-6 cups of water (warm)