I have been trying a few set up's and though I would post some pics of what is working very well for me right now as this comes up a lot.
I use this on the AT for two people filling two bladders at streams mostly.
Cut off nalgen canteen top and mark level, dip in stream and treat. I pour the water thought a coffie filter into bladders to get out any nasties.
With a helper it goes very fast.





