Conditioning Distilled Water?

I read earlier that one should "condition" distilled water, using herbs, sea salt, fruits, or possibly even oregano oil...

Can someone please explain to me why this is needed; and if it is indeed essential, how much fruit juice (for example) does one need to add to each glass of distilled water? I am currently unemployed and in a LOT of debt so buying bags of oranges on top of my already extortionate grocery bill seems unfeasible.

Thank you.