Have you contacted your clinic's nutritionist/dietician to see what they suggest? In the past I was able to get a sample bottle or two from them. Part of the problem with the ADEKs that we had a few years ago was that gastric bypass patients have discovered them and were purchasing them, causing a shortage.
I was never able to get a clear answer either. When our pharmacist was trying to locate the aquaAdeks drops, their pharmacy rep told them that they'd heard they might discontinue manufacturing it all together due to issues with the reformulation, but then a couple months later, it was available again. But by then DS preferred the bubble gum flavored source cf chewables.