Yes, with the exception of Avon N10, SF10 and CTF12 mask variants, which are not fitted with drinking systems. Special canteen caps with Avon couplers are available that fit to standard water canteens. These allow fail safe connection to the integral hydration tube on the mask (a variety of caps are available for in-service canteens).
Below are links to all the Avon Protection FAQ's including product specific queries.
If you have any additional questions please email protection@avon-rubber.com