How do fishmen produce water when there is no water around?
As state on wiki, Hody's body under the influence of Energy Steroids can produce water, so he can make a drip of water even when he wasn't soaked


  After overdosing on Energy Steroids, Hody appeared to drip with water even though he wasn't soaked, suggesting that he'd been secreting it.


So I think it's just like sweat, but with greater amount of water