I've done s-04 in store bought cider before, with nothing added. the juice started at 1.048 and ended up at 1.002 (and clear) after 10 days. It never fermented down any further. Hope this helps.
Primary:Russian River Redemption clone, Kelly's Melomel, Graham's English Cider 22-23
Aging:Public House Dry Stout, Procrastination Porter, Mr. Brown Ale, Westvleteren 12 Clone, Mead, Duvel Clone, Graham's English Cider 6-21, Belgian Draak Strong Ale, Fig Melomel, Acerglyn, Restorative Tonic Metheglyn