Well how about this? fill the bladder with $1 a gallon distilled water. When you come home hang it to dry.... With a clean Platty, black bacteria won't have as much of a chance to get started.

Also when using tap water with its "touch" of chlorine or other additives - I noticed on the trail my throat gets dryer. Distilled and Spring water doesn't appear to have the same affect.

Best tip!