I have always wasted paint for drying, as the pots never really closed, and I hated taking paint out from them into the palette with paper clips, stiks or whatever, guessing the right amount and wasting half of it.
The solution was obvious - especially after I started my ongoing shift towards Vallejo - Eyedropper bottles. They come dirt cheap in the local pharmacy, HUF 300 for a dosen - about €1.2 . Only thing I realized though - and I hate to admit that this is pretty useless outside Hungary - is that you have to ask for sterile ones, for plain ones come in white colour. If you want neat clear ones, go for sterile ones.
The rest is pretty straightforward, salvage all citadel paints still recoverable, dilute them with matte acrylic medium and distilled water to the right consistency and pour them into the eyedropper bottles. For this purpose instead of a small funnel I used a small slide made of a discarded plastic cup if anyone cares.
Finally I painted the tips of the caps in the corresponding colours, as I do with the Vallejo ones.
Actually I use much more Citadel paints ever since, and the pots are put to a much better use, with blue tack on top they make the perfect WIP figure holders.