To clean the reservoir, fill it about half full of water, add a few drops of dish soap, close it up with some air inside and shake. Repeat a few times, then do it a few more time with out soap to rinse it out.
To clean the tube, take off the bite valve and stick it under the sink.
To keep mold and other funky stuff from growing inside, store the reservoir in the freezer.
I have to think up a whole new signature? That seems like an awful lot of work...