why dont we use water as a conducter of electricity? when copper is so expensive and water is mostly free?

Question: why dont we use water as a conducter of electricity? when copper is so expensive and water is mostly free?
- Keywords:
  conductance,
  conducter,
  copper,
  electricity,
  water
Asked by ciara2219 to Charlotte, Jo, Kevin, Louise, Valeria on 19 Jun 2012.
- Joanna Cruden answered on 19 Jun 2012:
  
  I don’t know the answer but I would imagine it would be much more difficult to control water and the electrical current that goes through it, , in the same way we do copper, plus how would we stop the water evaporating?

Question: why dont we use water as a conducter of electricity? when copper is so expensive and water is mostly free?