Noodler's 4.5 oz bottle review
Seems I always need a drop or three of distilled water at some point or other when I'm tinkering with a pen, whether to ease the reassembly or dissolve a little ink or replenish evaporation in one that doesn't seal as well as, perhaps, it should. When I ran out of Heart of Darkness I refilled the bottle with distilled water, and now I'm set.