i had my first water bill today, i moved house in july, and my new is on a water metre (new property), i use 400 ltres a day and i have an ro system....anyway for a three month period my bill is £405
i expected it to be high but not that high....
Mike 108, a friend of mine does something called 'rain water harvesting'. I know next to nothing about it, but Jeff B does it also too; he's got an in-depth post on the DIY forum about it. Basically it's about collecting rainwater (which has a low TDS) and putting it through a filter or something.
Anyway, Mike 108 says it's great; though I didn't really ask him much about it.
Sorry I can't help more; I'm not on a water meter so haven't taken much of an interest in it. But there is an alternative way of making pure water from rain. I don't think it's a major trauma to do either.