Well, I'll tell ya. Violins are constructed with water soluble hide glue. If you filled your violin with water, it would fall apart in five minutes or less, with the pressure of the strings an' all. I was in violin making school and I know!

Use one of the big metal mutes and maybe practice somewhere else. Friend's house, school gym, or even the car, (if there's enough room). I feel for ya, I always want to play and sing most at night when my parents are asleep!

Good luck! Just don't put a drop of water in that violin!