Welcome to BB Spooky’s Mom! It’s wonderful that you decided to add a rabbit to your life, and it can be very nerve-wracking to have lots of unanswered questions. Owning a rabbit is definitely a big responsibility and there’s lot of learning to be done!
Litter habits can always be taught. How adherent a rabbit will be and how long it can take can depend both on the owner’s training techniques, as well as the rabbit’s own inclination. For example, some rabbits will adopt litter boxes right away. Others, like my Wick, definitely prefers not to go in the litter box, but he does -most- of the time because he understands that’s what needs to happen. Cleaning up accidents, bringing Spooky to the litter box before/after an accident, and doing these consistently can help.
Nudging can be a means of asking for attention (grooming, food) or asking you to get out of the way.
As for ACV, I’m unsure. I do not think so because I actually put ACV (with the mother) in Wick’s water to drink.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.