Playful:
* "I'm dropping in for a visit!"
* "Catch me if you can!"
* "Just a little sprinkle of magic!"
Philosophical:
* "We're all just tiny parts of something much bigger."
* "Every drop counts."
* "I'm going to make a splash."
Sarcastic:
* "I'm not just water, I'm liquid gold!"
* "Don't mind me, just trying to make the world a little wetter."
* "I'm the reason you have puddles to jump in."
Bonus:
* "I'm a natural born drifter."
Let me know if you'd like more options!