Water

Water is a chemical substance. As it makes up close to 70 percent of their bodies and its consumption at least once every 3 days is necessary for their survival, it can be considered the human equivalent of energon. Water can be an irritant substance to Transformers as it may cause their bodies to rust.
Fiction
Marvel The Transformers comics
Water is so rare on Cybertron that Wide Load and Rollbar had never even heard of it.
Cybertron's surface is covered by at least a few seas, but these seas are not of water. The Rust Sea, for example, is a sea of, uh, rust. There are chambers deep inside Cybertron which also run with liquid, The Primal Scream Out of Time! but they have been confirmed to be not water. Darn 'n' Blast #303
The Transformers cartoon
Water applied to a human's epidermis frees him from the controlling effects of Soundwave's hypnotic ultrasonic suggestions. Auto-Bop
Trypticon seemed to end up getting tossed into water quite a bit. Five Faces of Darkness, Part 5 Thief in the Night The Ultimate Weapon Fight! Super Robot Lifeform Transformers issue 6
Generation 2
Some Transformers, namely the Aquaspeeders, Stormtroopers, and Color Changers, use high-pressure water-cannons as armaments. This is after they apparently re-discovered water, or something.
Cybertron cartoon
After scanning a fire engine as his new alternate mode, Optimus Prime began carrying a supply of water which he could spray from his cannons to extinguish fires and on one occasion a Decepticon warp gate. Inferno Trust Revelation Most of the other Autobots were also capable of carrying water, although their efficacy at extinguishing flames was not as great. Unfinished
Animated cartoon
Optimus Prime was armed with a high-pressure water cannon. Transform and Roll Out
When facing off against space barnacles, Sari Sumdac used boiling hot water to burn them off Prowl and Bumblebee. Nature Calls
Wreck-Gar would end up immersed in the stuff for quite some time. Garbage In, Garbage Out Human Error, Part II
Sentinel Prime hates most features of organic planets, and water is no exception. He especially hates that it falls from the sky on Earth. Jazz, on the other hand, was highly appreciative of a planet that could double as a car wash. Where Is Thy Sting?
EarthSpark cartoon
The Earth-born Terrans did not run on energon, instead subsisting off the water that had birthed them. Friends and Family
Games
Transformers: War for Cybertron
The Kaon prison complex was seen in what appeared to be heavy rainfall. War for Cybertron
Transformers: Devastation
Kranix considered the large amount of water on Earth made the planet impractical for cyberforming. Devastation
Toys
Notes
- Occasionally, the fleshlings like to hand out minuscule samples of this substance as promotions for their documentary footage of Cybertronians.
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