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This is what I use.
Using these across all my bikes is quite helpful.This is the setup that works for the Brompton stem and doesn't need a specialist bottle.
https://www.fidlock.com/consumer/en/twist-uni-connector-uni-base/09627-000002-blk
general_greyharbour
@Dammit
In a Brompton place in SG I've seen them use the Fidlock system for bottles - there is a mount available from Fidlock that clamps to the stem with a band IIRC.