- Mix ¼ ounce of yeast with 1 cup tepid water and let stand 10 minutes.
- Add the root-beer concentrate to the sugar, mix well and dissolve in 10 quarts of tepid water.
- Add the yeast mixture, stir well and bottle the root-beer immediately, fastening the caps securely.
- Set in a warm, draft-free place for 3 - 4 days until the root beer become effervescent.
- Serve chilled.