Largest plant's bucket got empty on accident;...

That's quite the stress for a flowering plant, even if it recovers, it will affect the yield. The roots might and probably have been damaged. I would advice patience, it might take a few days to recover, be sure the solution is well aerated, an air pump would be a good idea if your are not using one. Perhaps a root stimulator could help. Good luck mate.

Hi homie ! So what I can say about your droopy leaves is that a water deprived plant take longer and sometimes retain the drooped over look on the old leaves until they fall off ! Do you have any air pump in your system , it coul help you plant recover from her O2 lack due to that empty bucket. And how about your roots ? did you check them to prevent any fungus ? I hope it will help you for the best 💪😁