I had my Camelbak Blowfish cleaned with bleach after I discovered some mold in the drinking tube. I called Camelbak and it was suggested that I add two teaspoonful of bleach to a bladderful of water and let it seat a while b/4 cleaning thoroughly.
It worked in getting rid of the mold, but there was a subsequent bleachy aftertaste to the water (I only use it for water).

I have been adding a teaspoonful of lemon juice to my bladderful of water, and this has helped a lot in getting rid of the aftertaste.

So, I am going to suggest you try adding a teaspoonful of lemon or lime juice to your bladderful of water, and this should help.

FWIW, I also rinse out my Camelbak's bladder as soon as I get back from my rides, and then toss it into the freezer, where it stays until it has to be used again. I have not seen any problems thus far, molds or otherwise.

Regards,