My camera bag holds lenses but drink bottles. That's how I came up with this idea. I want to hang a soft drink bottle on my camera bag or any bags!

Now, most of the soft drink bottles can just function as the expensive aluminium bottles with a carabiner clip.

Unfortunately, there are a few soft drink bottle sizes. This one seems to be the more common one.

In terms of the carabiner, just buy it from Amazon or any stores that have a carabiner with diameter of 6mm or M6.