There is the Pure Hydration Survivor S58 based on the old fashioned military water bottle designed in 1958. These are military issue bottles and water filters.

http://www.purehydration.com/survivor-58-bottle/

It will fit snugly into a BCB Crusader Mug, which will fit inside a PLCE webbing water bottle pouch along with a Bushbox Titanium Outdoor Pocket Stove, Millbank Bag etc (used a Brew Kit and ration heater system)

http://www.amazon.co.uk/Bushbox-Titanium...=titanium+stove

I have been quite impressed with their in line filters as well for Camelbak bladder type systems as well.

http://www.purehydration.com/survivor-inline/

especially when used in conjunction with the Pure Hydration Armored Reservoir.

http://www.purehydration.com/armoured-reservoir/
http://www.youtube.com/watch?v=e5qRzOzOQqg

You can always fit the Katadyn Activated Charcoal Bottle adapter on the output of a conventional Katadyn Water Filter. Activated charcoal can be replaced with sachets.

http://www.katadyn.com/en/katadyn-produc...mit-aktivkohle/