You can make a primitive airbrush - or an atomizer- bamboo or any hollow stem cut s that you can blow through one half over the open end of the other which is immersed in pigmented water.
A modern metal version:
https://www.dickblick.com/products/art-alternatives-mouth-atomizer/
Yes, you can. :)
I suppose the ancients in Indonesia could have discovered the same technique as the ancients in France several thousand years apart from each other, like knowledge of the Romans and Greeks that was lost during the Dark Ages and had to be rediscovered.