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Depending on what you want the inner flask to be made from, you might try Amazon. I just googled Amazon.co.au and found 200mm glass test tubes (there was one offer for $0.97 per tube). Or for something a bit less fragile maybe a plastic graduated cylinder like we used in Chemistry class in school.

If you drill out the hole for the flask and fill the bottom with a food-safe resin, you could just slide a tube of glass, plastic, or even stainless steel into it. The resin will seal the end and the tube itself will hold your tipple of choice.
 
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