I've mostly switched over to metal bottles with about a 1" opening. (And discovered the stoppers are not always interchangeable.)

Another vote for wide mouth stainless NALGENE's.I also use the Human Gear CapCap.To remove the metal Nalgene from a cooking fire use a multi tool or a carabiner clipped inside the top rim.I have seen a wood toggle used to suspend it over a fire also.A lot of options on the metal water bottle.Go with wide mouth for options.....

BOATMAN
John

For SS bottles in the fire, use a set of wire fish mouth spreaders. They are cheap and can store in the bottle when not in use by simply squeezing them.
When open you can insert into the bottle, simply use them as bail and hang the bottle above the fire or as a handle. I can't take credit for the idea, some viewer suggested it to Dave Canterbury and he liked the idea too so he added it to his repertoire.

And of course, everything in your kit should be multipurpose so you can use them as initially intended to spread a fish mouth to retrieve hooks.

I have lots of canteens,since I spend a lot of time in arid country, and variety is a good thing. My favorite, however, is a recycled Gatorade (or similar) bottle - light (much more so than Nalgenes), cheap, watertight, and expendable. I usually slip a SS canteen cup onto the bottom to allow for cooking in a nice cheap, light setup.

Fish spreader! Never heard of it befor but .... sure looks like the solution.

I'll second the Human Gear Cap Cap. They're a way better solution for the widemouth bottles than the "no splash" inserts - I had those for a while, and they almost without fail get pushed down into the bottle. More trouble than solution, in my experience.

Won't it ruin the mouth roundness or the thread ??

I've never had threads noticeably damaged this way. I have seen small scratches on the lip.

I use wide mouth and pack a straw. I can't drink from anything but a straw or tube when I am moving. It just don't work for me otherwise.

Much as I hate to do anything so silly as to purchase bottles of water, we occasionally get the bottles of Poland Spring with the squirter nozzles. The squirter prevents backwash, so they can be refilled indefinitely without being cleaned. The plastic of the bottle feels really flimsy, but we've never had one fail. I like having a semi-disposable canteen that I don't care if I lose it. I also like the squirter to possibly cleanse wounds.

David