For these cases, it's good to have a quick-and-easy fermenter that's small enough to do quick runs.
Step 1: Collect Components
1 - The base of the fermenter is a bottle of soda, any size. Here we use a 2 liter bottle.
2 - Airlock. This is a cheapass one from the brewstore.
3 - Plumber's Putty
4 - Hole making tools