Reverse Osmosis water in battery

Is it OK to add reverse osmosis water instead of distilled?

I believe RO leaves behind slight amounts of minerals, but distilled might leave behind a few chemicals too, like chlorine.

So is it 6/half a dozen? Or is distilled the only way to go?

Also, is it possible to revive a dead battery by topping it off with water and slowly charging it with a charger?