You only need about a drop per liter or so, it's basically the same as city tap water, it doesn't appear to have a effect on Nalgene or smart water bottles, I don't own a bladder but it would probably be fine. It's only good for bacteria (and viruses but if you are worried about those id pack all your water in), parasites can survive bleach so you have to be careful what water source you use. I prefer the Sawyer filter but it's fine for a backup. The old school ultralight guys use it as a primary, you don't need a secondary because you can't really break bleach.