I guess this is not a beginner question, but I haven't brewed in a while, so I feel like a beginner. I probably never really got much further than a beginner stage, but I felt like I was comfortable with what I was doing.
Anyway, funny situation here. A friend of mine bought a brew kit that came with two malt syrup cans. He used one and made half a batch. He has a bigger bucket now, and I told him he can just use one can and get some more yeast and add a certain amount of sugar and make the full 6 gallons instead of just a 3 gallon batch in his bigger bucket.
However, I can't remember how to know how much sugar to add. I know that he added half the 6 oz yeast packet, so I know to pitch 6 oz of yeast.
Am I right about this? I'm pretty sure I've done it quite a few times before. I mean, some flavor may be lost, but the extra sugar will react with the yeast and make the full amount of alcohol right?
How would I calculate how much sugar to add? I can't remember what I did at all.