I have substituted applesauce for both sugar and liquid in making muffins. I made the applesauce when I could get eating apples super cheap, cooked them down to a puree and bottled it in jam jars. When I made my muffins, I just tipped in a jar of the applesauce to substitute for both sugar and liquid and it worked nicely. But only very sweet eating apples would work with this substituting for sugar. – Annette in Canterbury