Yes for the camelback! I keep mine filled with water & in the bottom of the fridge. It stays fairly cold (even in Arizona) and I'm much more likely to sip & stay hydrated.
I put ultrafuel or cytomax in my bottle with ice cubes. I, too, have to dilute it because it's way too sweet & strong.
My bike is so small that I can only get one water bottle cage on the downtube - so a camelback is essential.
Kim in Tucson