One day is not going to completely derail your progress. Your water weight may go up because of the additional carbs but it’s just water and will go back down, as long as you get right back on track the next day.
I agree with nobodyshome123. If you jump right in to your routine the next day you shouldn’t have any real lasting repercussions from one day of indulging. I’d skip the scale for the three days afterwards if seeing a brief uptick would discourage or derail your progress.
I tend to think of the increase on the scale from one-day indulgence as “ghost weight”: it can disappear like it’s never been there as long as I immediately return to good habits. It will linger longer (and increase) if I don’t pull myself back after a day or two.
If you wanted to you could eat 16 ice cream cakes and wash it down with root beer. One day is inconsequential in the long run. Your stomach has likely adjusted to the lower intake so you won’t have room to eat that much anyway. You might feel like crap if you eat a bunch of sugar, but a single cheat day doesn’t really do anything to your journey as a whole.