I am fermenting 11 litres (3 gallons ) of apple cider. I have added 3 campten tablets and have waited over 12 hours. Now I am just ready to pitch the champagne yeast and the yeast nutrient. I have come across a couple of recipes that call for the addition of brown or white sugar. What is a good amount of sugar to add to 3 gallons of cider? (I am planning on adding 2 packets of champagne yeast and 3 tablespoons of yeast nutrient). Any advice would be greatly appreciated!