You didn't say how removable you wanted it to be. I know you can get band-on ones, but I've been quite impressed with this velcro-on one: https://www.sjscycles.co.uk/bottles-cages/sks-anywhere-bottle-cage-adapter/. Very stable.
Good to know about the SKS one; but I'd forgotten the name/description of band-on ones, that's what I wanted. Ta!
@branwen started
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You didn't say how removable you wanted it to be. I know you can get band-on ones, but I've been quite impressed with this velcro-on one: https://www.sjscycles.co.uk/bottles-cages/sks-anywhere-bottle-cage-adapter/. Very stable.