A glass with a water and an overhanging cloth inside it functions as a drip feeder.
Place a small sauce tray (or something like it) underneath to catch the droplets and make them bounce out of the surface. You will also need a speedlight, ideally at a low power setting, to freeze motion and capture a crisp image.
How to Shoot Refraction Macro Photos in Water Drops, Glass Beads and More: https://youtu.be/hbT1FBXJWhg
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