It does not always has to be water for drop photography. I used [deluted] paint as well , use a good quality paint and the results can be fantastic.
And I always use 4 or more flashes to get enough light and to freeze the action. Water drop needs around 1\10000 of sec to freeze the action. I can only do that by using my flashes at 1\64 or1\128 power [that gives light about 1\8000 or 1\12000 of a second. of course that gives not enough light and that ia why I use 4 or more flashes....
And I always use 4 or more flashes to get enough light and to freeze the action. Water drop needs around 1\10000 of sec to freeze the action. I can only do that by using my flashes at 1\64 or1\128 power [that gives light about 1\8000 or 1\12000 of a second. of course that gives not enough light and that ia why I use 4 or more flashes....