From Kirbypedia

Name:	Water
First Game:	Anime Only
Enemies Copied from:	Air Rider
Helper:	None
Anime Episode(s)	097

One of Kirby's Copy abilities. This one is unique to the anime, and has so far not appeared in any game. (Except for the similar Bubble ability.)

Along with Top, Iron and Baton Twirling, they all appeared in episode 097 of the show, and were all created by fans! There was a contest in Japan to submit your own Copy Ability ideas, and this was one of the lucky winners.

Water Kirby's body changes to what looks like a translucent blue gel, with a golden crown containing a cresting wave on his head. Naturally, Water Kirby attacks by spitting geysers of water to blast the enemy away.

Kirby Copy Abilities:

Cupid - Animal - Backdrop - Ball - Balloon - Baton Twirling - Beam - Bomb - Bubble - Burning - Clean - Cook - Copy - Crash - Cutter - Fighter - Fire - Freeze - Galaxia - Ghost - Hammer - Hi-Jump - Ice - Iron - Jet - Laser - Light - Magic - Metal - Mike - Minimum - Missile - Mirror - Needle - Ninja - Paint - Parasol - Plasma - Sleep - Smash - Smash Bros. Abilities - Spark - Stone - Suplex - Sword - Throw - Top - Tornado - UFO - Water - Wheel - Wing - Yo-yo

Final Weapons:

Star Rod - Love-Love Stick - Rainbow Sword - Star Chariot - Master - Triple Star - Block