Ok so tonight I'd like to start my second batch. I learned a lot from my first batch, which will be dumped down the drain. This time I plan on using ale yeast, S04 if I have read right. I was going to pick up 5 gallons of Musselman's Spiced Cider at Walmart and try that. How does this plan sound? Should I try another kind of store bought cider or juice? How much head space should I allow in my primary? Also, any other additives I should add...sugar...what kind? Any kind of criticism is appreciated.