Dear D.,
So sorry to hear about your struggle. I share your pain - my 15 week old won't take a bottle either! My son, who is now 4, was also a refusenik. With him, I was going back to work when he was 4 months, so I was desperate. I don't remember how we did it, although eventually he would take the VentAire (but ONLY the VentAire!) I just read about a bottle called the Adiri Natural Nurser which I'm going to try. It has good recommendations for fussy babies and is also BPA free (yucky toxic chemicals are present in most baby bottles - maybe our babies are smarter than we think!)
My only other advice is to be patient with yourself and your baby. I'm sure life is VERY challenging with a 19-month old as well. But even if your daughter never takes a bottle, within a few months you can try weaning her to a cup for day-time. So while it feels like forever now, your situation will change, even if you do nothing.
Good luck!