Interesting, I was dry on that day as well.
I think I should refrain from dry fasting in the first 4 days after eating.
Anyway I dry fasted ~12 hrs after last nights meal, and the sand paper in my mouth feel was just too much to bear.
I'll probably do one more dry spell for ~12 hr maybe sunday morning (its just no drinking water right on waking up for 3-4 hrs LOL)
But dry fasts only after day 4 or 5 if I even feel I need to after 4 days of fasting.