Thank you all very much, fantastically helpful answers as always! I'm sorry I didn't think to do a search before posting.
I forgot about collapsible bags. New ones are quite pricey, and I found the narrow necks very irritating. And I have had bad personal experiences when emptying wine bladders too enthusiastically, so I'm inclined to stick to the bottled stuff! Glass bottles appeal for the darkroom because of their easy re-use.
So I'm off to buy a cheap can of butane lighter fuel, and I already have 1ml syringes and heat shrink.
Many thanks.
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