Sound of a single droplet. The standard sound for like a leaky faucet or a drop hitting a puddle or bucket of water. I actually made this sound with my mouth and tapping my cheek at the same time, but it is a very convincing drop sound, which can easily be looped at the speed you want for that "continuous drop" sound in the background.
Using an inflated toy balloon in a bath full of water to create some interesting sounds. The balloon hitting the top of the water almost sounds like a drum, and my fingers on the wet rubber could be useful in a cartoony squash and stretch capacity. Recorded on a tascam dr-05.