Done that many times. You'll be good -- there is no "vinegary" effect on the taste. In fact, apple cider vinegar seems to take any bitterness out of the bark.Well...I just realized this morning at 6AM, as I placed my Boston butt on the smoker, that my wife had drank the last of my apple juice.
So today we are using 50/50 mix of Apple Cider vinegar and water for the spritz. Should be interesting!