I've been in USA for almost 8 years, and, can you believe it, I don't even know how apple cider tastes?! Somehow, I never felt the urge to try it. I like apples and sometimes eating them with peel makes my gut behave a little off. But I don't know when or why, as it seems to be irregular thing.
And as for apple sauce. It's one of those old remedies for D, even in kids. BRAT diet - banana, rice, APPLE SAUCE and toast. So it should be goo for most of us