RO water would be ideal, however with the situation I am in I unfortunately cannot install one. However, I am incredibly lucky to be able to buy distilled water very, very cheaply and it's available within a 1 minute walk from where I live so I don't mind absorbing the cost.
In that case, would distilled still be ok to use? I have found conflict from answers online with some saying it's fine and others not recommending it. It's left me more confused than informed if I'm honest!