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Just bought a karrimore hydration cleaning kit from amazon, £4.99 with all the bits you get in the official camelback kit. Plus I got a free mug 
[s]Link please?[/s]
[b]
EDIT[/b] done
http://www.amazon.co.uk/Karrimor-Hydration-Cleaning-Kit-Multi/dp/B004Z95B6A/
I've got 3 of those sodding mugs.
And when they are gone, just get 30x denture cleaning tablets for 40p from the supermarket.
PaulD
I use milton - it tastes nice!
I need the brushes to get the gunk out of the tubes...as well as using Milton tablets
I need the brushes to get the gunk out of the tubes
Just store in the freezer, you won't get any gunk in the first place
I use an army rifle pull-thru string with a piece of cotton in the jag-ring to clean the tube...very quick and thorough and leaves it dry.
PaulD
Milton fluid or Wilkos equivalent job done.
Milton Fluids once every couple of months and keep it in the freezer when you're not using it.
Job done.
Decathlon do a half decent one.
Those of you who keep their camelbak bladders in the freezer, how do you find the space? Mine's crammed to the gunnels with reduced price loaves of bread these days.
To dry tubes, either disconnect both ends, go out in the garden and spin it around as fast as poss. Centrifugal force pushes out all but the tiniest drops.
Or use some garden wire, wrap one end around a small peice of tissue. Pull it through. Leaves tube bone dry.