Using dip pens and Indian ink outside
When using pen and wash for landscapes and cityscapes outside, I use either waterproof fibre tip pens, or fountain pens with a non clog waterproof ink (Noodler's Bulletproof).
I can't get much variation in line thickness, so I'd like to use a traditional dip pen, which has flexible nibs, with Indian Ink.
I'm put off using Indian Ink outside because it's so easy to knock over the bottle when drawing.
Has anybody any suggestions for storing ink in some sort of bottle that is stable and minimises accidental spillage ?