Water Water Everywhere - But not a drop to...

MSR Miniworks Water Pump - I used one on an Apalachi Mountain excursion and it is good!  Be very careful off the ceramic cartridge though - it'll break for sure just when you need it.  Figured out if you carry it surrounded by gobs of bubble wrap in a rucksack - it can take a fair amount of jostling.  Just don't ever drop it.
http://www.amazon.com/MSR-56425-MiniWorks-EX-Microfilter/dp/B000BBF2RY

Some kind of water treatment is a must!