Hi,
A completely different approach: I have also always bought bottled water and used it even for cooking. But it's very tiring to buy so much water. A year ago I thought I'd just try boiled water. The chlorine evaporates and germs are killed. And I don't find any difference in taste to the bottled water. Just an idea. I get on well with it, though the tea doesn't taste the same as at home.
Monika