The mini macro fisheye lens effect to a water droplet is quite the challenge. After many failed attempts, I was finally able to get a few decent ones.
The process is quite simple, but the timing is the real challenge. You have to be quick. First you want to use some macro extension tubes to attach to your lens. You want to zoom all the way in and focus the manual way. Once that is complete, make sure your flash is set to go and then spray the flower or object with a spray bottle or a water dropper. Once that is applied you have to quickly snap the picture with the right camera setting of Aperture: f/18.0, Shutter: 1/60, ISO: 100, depending on the lighting situation. You also want to take a look at the image on your computer to make sure that it is focused well, etc.