That's just miserable, Dorothy. I don't know where you live, but if it's in the EU, the UK or the US your tap water is just fine. My cats have always sought out the filthiest pondwater or puddles to drink from and they routinely live to 19 or 20 years old. With rare exceptions and accidents, your tap water is free of heavy metals, bacteria and viruses. And it makes a much better cup of tea than distilled. Live a little and risk a very little.