Can running water carry an electrical current indefinitely, and for long distances? Okay, not a scientist, but doing a writing project that requires a little knowledge. My question is: If there's a constant source generating enough energy into running water (like a stream, surrounded by non-conductive material) could the water carry an electrical current for an indefinite period? Basically, doing the same job as a wire. 

I think the conductors in the water (minerals) may deplete over time because of chemical reactions to this process...but if it's a running stream with constantly renewed minerals, could this happen?

Edit: Clarification was requested for a couple parts. 1) Method of conduction to the water: Not that important, really. I guess a wire capable of conducting the necessary amount of power could work. 2) How fast the water flows: I'm not sure. A strong currant, I guess. But not as severe as rapids.
I assume that the fundamental problem with this idea is that due to inherent resistance of the water, heat will be generated. As a result the water will evaporate. If there is no space left for the gaseous water vapor the "pipeline" will just explode.

That is basically why conducting wires are made of copper, it mirrors a remarkably low resistance. Silver and gold would be even better but more expensive on the other hand. Consequently copper is the standard material of wires.

If constant cooling of the system would be permitted, it could basically work. 
water itself does not significantly conduct electricity, but with electrolytes dissolved in the mentioned (as suggested by the author of this question) it becomes conducting.
As long as the ions do not precipitate the liquid retains the property of conductance.