What kind of chameleon do you have?
If you're using clean drinking water (I just buy the 2 gallon drinking water jugs from my local grocery store) then you shouldn't need a water conditioner. From what I can see from the picture (its cuts off halfway for me) that's the supplement you use bi-monthly to dust your feeder insects in, so yes you need that. I would take a look at the care sheets here on the site for your respective chameleon. Each breed is different.