For air you can use Rain to link the enemy and you(standing on the same water surface),and cast any electric skill to the enemy.(Shocking Touch,Electric Discharge,Dazing Bolt,etc.)
But it will cost you 2ap. (You can cast Rain before combat starts)
(And btw, electric water would be unstable not only the duration but also the way it works with the Shocked status.If someone with 0 magic armor and wet/shocked status is moving or acting on the electric surface,the electric water will turn back into water again and cast 1 more Shocked/Stuned status to the one.)
If u want stronger and more stable electric surface,there is a way, but it will cost your source points:Rain+Closed Circuit+Pressure Spike.(maybe +1more shocked spell)
It will turn the Cursed Static Clouds into Cursed Electric Water,which gives strong shocked effect to stun any target with 0 magic armor, and does not easily die like the normal electric water.
(Sry for the English XD)