Tamyia do empty screw top pots in the same fashion of you can just use the ones which had medium in them when empty as these need little or no cleaning out I find.
As a note I loathe Vajello dropper bottles and the few I use (mostly mediums & the like) I tend to decant into Tamyia pots. I tried vajello paints years ago & thought they where rubbish though I understand they have improved a lot since I am still rather put off by past experiance.
Ginger