For people who don't drink a lot, 5 gallons of failed beer is just too much to drink. Additionally, when experimenting with recipes, it's nice to be able to test several batches at once to get the mix just right, testing each iteration side by side.
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
You probably have all of this in your house. I did, which is why these were the materials used.
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