Re: camel back help
you just gotta run some water thru it if it's new.
if you use powdered drink mixes, it <span style="font-weight: bold">WILL</span> get moldy and become unserviceable. period.
they make a handy cleaning kit, but you should be able to just use a nylon brush on a cable (look at musical instrument supply places like the woodwind & brasswind, trumpet/trombone size probably the best) and warm water with a very mild detergent, rinsing thoroughly.