So, totally new to homebrewing. The recipe called for 5 gallons of water to make the wart, which I boiled. When I was done, I had 4 gallons. I know NOW that I was supposed to add water to get back to 5 gallons in the fermenter, which I didn't do. Now it's time to bottle. My question is: do I boil 4 oz of sugar in two cups of water per the directions or should I boil a gallon of water and the sugar to get back to 5 gallons?