I’ve never had to bring lots of ink with me, but whenever I go to vacation I pack couple of things - gouache, walnut crystals and empty ink bottles (similar to dinky dips). Once I reach my destination, I mix needed colors and use them as I would at home. Before leaving I empty and wash bottles so I don’t have issues at the airport and I don’t want to risk spilling. For extra protection, everything is packed inside ziplock bags. The only thing I have in my carry on are holders, everything else I pack in checked bag. I know gouache can travel in the suitcase, but just in case, I leave printed product sheet info with it.