When I cook some apple jam, I just use some apples, squeezed lemon, some sugar and some stick cinnamon. That's all. No additions, preservatives at all. Sometimes people say they add some water to simmer but I don't add any water. I just leave apples and sugar together in a pan for 1-2 hours, then some water come out from the apples, then it's time for me to start simmering the pan for hours until it's done. But anyway, it's not a small amount as you see, it takes entire day from early in the morning throughout late evening.