If you want to grow them in water you can just simply leave them in the water forever. Well, that's relative --- as it grows you would need to move it up to a larger bottle or cut it back but they will grow in water alone.
I am a strong believer in the simple fact is that what matters in this life is how we treat others. I think that's what living is all about. Not what I've done in my life but how I've treated others. ~~ Sharon Brown