Airport security compatible container for small amounts of alcoholic spirits (drinks)?

When travelling, I tend to find that the alcoholic spirits I like either aren't available, or are charged at some ridiculous markup that makes them unaffordable.

For a long trip, my usual solution is to pick up a bottle of something suitable from Duty Free on my way out, and pack what's left carefully in my suitcase for the return journey.

For a short trip, that approach presents two problems. Firstly, I wouldn't put much of a dent in a whole bottle, so I'd gradually accumulate 3/4 full bottles at home! Secondly, I often do short trips with hand luggage only, so I don't have a checked suitcase to put the bottle into.

I briefly tried finding "miniatures" (5cl bottles), and then later refilling, but generally the cap stops sealing properly after a few refils. Since these aren't that cheap to start with, to only get a few trips before they begin leaking means they're not a long term option.

Does anyone know of any good resealable / refillable containers, which can be taken through airport security, aren't too bulky, and are suitable for holding something like 5-20cl of alcoholic spirits (40%-ish)?