Prompted by the thread "Water Treatment - Hybrid Filter" in the gear section and Travis's version of his Kathadyn Hiker filter inside the Nalgene Cantene ( Mine is the Pur version) , I thought of a way of securing the filter to the Cantene.
Not wanting to butcher the Cantene top, I found on my gear shelf two lids that fit. One is from a mineral supplement container, the other from a sauce container (I already had chopped the squirter off...) .
So 15 minutes later I had a screw on sleeve for the hiker.
If you look at the picture of the lid with the top chopped off , you might jst see that I have made a bit of a groove so that it now screws on the thread of the Hiker. So you screw the modified spare lid onto the Hiker and that will screw on the thread of the Nalgene. If your filter has no inner thread than you can tape it on.
BTW, as you can see on the top picture, mine stays there without the screw on lid, but may come lose with use . The O ring seem to do the job.