The Delta training people don't believe in spray bottles - they think they're cruel. I disagree. I find I don't need a direct hit any more, a near miss will do, and my dog isn't freaked out or upset by the spray - in fact she will chase it (or a spray from the hose) round the garden if I need any assistance to get her to exercise more. And I never used vinegar or lemon juice drops in the water either.
I'm glad you're getting all sorted. I had neighbours over my back fence when I lived in another suburb, who had a small white fluffy bark a lot dog. It would bark at me in my house. It would bark at possums all night. I could handle the day time stuff but really objected to continous barking at 3am when I had to be up at 6am. That dog disappeared one day. Which was a bit over the top if you ask me. The owners made no attempt to re-train it. They'd occasionally yell at it - which it, as most dogs would, took as encouragement ie the owner is joining in, it must be something to bark at.