This will show you steps of making the experiment right.
Step 1: Step 1 for Baking Soda and Vinegar
The first step is to fill the plastic canister about 1/4 of the way with vinegar.
Step 2: Step 2 for Baking Soda and Vinegar
Then you want to fill the cap with baking soda ( If you can find the canisters that do that then its about a teaspoon of baking soda.) Then add like a drop of water and it will start to soften and become moist.(If its easier you can just get a cup and fill it with baking soda and a little water, if its to water add more baking soda.)
Step 3: Step 3 for Baking Soda and Vinegar
Next you need to fill the cap whole all the way or a teaspoon and head outside with the cap and container (not attached.)
Step 4: Step 4 for Baking Soda and Vinegar
Next get close to the ground and snap the top on. Once its on flip the canister over and you don't have to worry about being quickly it will take a minimum of 10 seconds for it to react.