You haven't lost 16 days, we all fall down and you've got back up and you're here.
It sounds like you did what happened to me last time (and many of us here) and went on autopilot, not even challenging that annoying voice encouraging you to drink. I'm only on day eight but one thing that's helping me is to have a plan to deal with cravings and being mindful.
I wish you the best and keep posting!