Cleaning the bladder from a hydration back pack is a pain, no bones about it. Getting it dry so it stays non-funky and fresh for the next use now thats hard, especially in a country with not a lot of sunshine.
So the solution and tip for this week is wash the bladder well then throw it in the freezer. No germs can grow in there and it wont start smelling. They thaw in seconds once you run them under the tap as well. Easy.
Remember boil your bidons.
Ride safe.