Oh so you mean twice a day? Because it's important not to let the water sit with any contaminant longer than 24 hours, that's how long Cocci take to reproduce in the water. :) I only mentioned all this because I know what it's like to lose birds.
I'm not sure on gender, sorry. I came because I have some home bred fibro chicks from Mosaics, it's funny how they happen to look really similar to your purebreds! Still not sure of the genders on mine.
But I just wanted to say to be careful that the water source is clean especially from poo...