I was wondering if I could still have raw acv or dandelion tea before my meals too...I have low stomach acid and need something to help my gallbladder out when I eat to avoid pain.
Of course, for the first two days, you're not supposed to use anything that's not listed on the intro diet, but you'd have to decide if these supplements are essential or not.
The SCD doesn't have guidelines about food intolerances, so you could try following the GAPS advice, or just try introducing a previous problem food whenever you're comfortable doing so. If there are problems, you can always drop it and try again later.
If you have other specific questions about doing the intro & early stages, it might be easier if you post them in the "SCD slow & steady thread." I'd be happy to go into the details, look stuff up, etc. (The reason I started that thread was that these combined GAPS/SCD discussions can get kind of confusing, for those of us who are just starting out and trying to figure out what we're supposed to be eating. )