I've mastered putting my bladder on my lap, and pumping clean water in it. At least with my kids along, I have extra hands...

I don't intend to use Platypus's bladder; I want to use a 1 L softbottle with their adapter to turn it into a hydration system.

IF the connection between the bottle and the tube is bad (it will be inverted) we're screwed. The physics of that connection is what bothers me - because we'll have to open and close it...