Recipe by: Time-Life - Bevereges Mix 1/4 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 neer become effervescent. Serve chilled. Makes about 10 quarts.