For our 1-gallon batches we use either food-grade buckets, fitted with a lid but leaving a small gap to allow gas to escape, or a glass demijohn (carboy) and airlock. They both have their pros and cons, as outlined below.
Buckets
- Light and easy to carry
- Large opening makes it easy to deposit ingredients into the bucket (but also easier for unwanted items to fall in)
- Plenty of space for fermentation, and easy to increase beer quantity
- Opaque plastic makes it harder to see the layer of sediment, making siphoning into bottles trickier
- Plastic will degrade and get scratched over time and will eventually need replacing