I agree with the comment that it would only really be a big deal if you were on antibuse.
If you ate an entire box and you have no alcohol tolerance then you might feel a little bit tingly or something.
But (and I shouldn't endorse this), a small bit of alcohol with Xanax isn't going to kill you. It's not a good idea largely because they can compound each other's effects like sedation and cognitive effects to the point that it's dangerous. Unless you had some underlying health issue, a small amount of alcohol isn't particularly dangerous. They just don't want you going out and having several drinks or more.

As for sugar alcohols, those are completely different. The kind of alcohol that gets you drunk and that is referred to on the label is ethanol, aka ethyl alcohol, two carbons (and 5 hydrogens) and an -OH
"Alcohol" just refers to the fact that it has an -OH. So a lot of different molecules can be called alcohols, but they're totally different. Those are not included in calculating the 0.07%, that's just ethanol