This is what I've come up with. Don't know how screen accurate it is - but it'll do the job for now.
Lalang plastic bottle from Amazon for £2.48. It did have a load of white text on it but it all came off very easily with a bit of light sanding.
Sprayed the lid silver, stuck a thin steel band around it and made a leather carrying case.
Haven't tried it with any milk yet. I'm just going to melt some mint ice cream. That should do the trick.
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This was the Amazon listing:
https://www.amazon.co.uk/gp/product/B01MCTLGZR/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
(Took just under one month to arrive)