Loving some of your shots there.IMAGE LINK: https://flic.kr/p/w9KQhC WD63
I've been dabbling with this as well and I find focus to be the critical thing.
I'll have the wife holding a pen where the drip is hitting the water and try to focus about 10mm above the water surface so any splashes are in focus. Live view and zoomed in is really helpful here.
Luckily, I have a friend who got me an IV bag with associated controller for drop control - ideal for this situation. Make the drops as fast or as slow as you want.
My shots are all done manually with me watching the drop leave the tip and the camera being fired by a remote trigger. Practice, practice, practice.
And try different angles, backgrounds, colours, liquids (milk, oil etc).
One of my favourites with milk, food colouring, and a couple of quick drips.
, on Flickr