As Palli said, it'll certainly work. I'm not sure if there has been one on oxycodone itself, but there have certainly been threads on creating nasal sprays with water or saline for hydromorphone, oxymorphone and probably others.
It seems like your only question was if this is possible and the answer is certainly yes... If you filter it and use bacteriostatic water you can store it as such as well but otherwise I wouldn't just leave crushed pills in water for long (bacteria).
If you want more info on technique search around for those nasal spray threads, some have had *many* responses and PM me if you have any questions.
Closed.