True, but the whole point of the 'social pact' that taxation is is that we all pay in as much as we r'e judged able to afford regardless of what we actually use, for the common good. You may use more water than I do but I may use public transport more than you do. Even so, society is not a 'zero sum game'; we don't all participate in society based entirely on getting as much in as we get out. That's not what society is.
Yes, if you're assuming the water system is being treated on a commercial basis. Which there's no definite reason it should. It doesn't
need to make profit to make investments if it's seen by society (and it's agent the government) as a vital service that must be supplied and that supply must be ensured. You're still in the mindset of treating water supply as a business. You
can treat is as a business, indeed you can actually run it as a business, but there's no absolute reason it can only be done that way.
It's not even the case that a countries economy is a closed system so money for A means less money for B. A government can create money any time it feels like it. There are consequences to that but they can be managed in a variety of ways and it's essentially a political choice which of those consequences people are prepared to accept.
Everything does not have to be a business. Many things are best run as businesses, absolutely. I am of the opinion that the things that are essential to life are not best run as a business, because businesses inevitably have to discriminate good customers from bad customers and in the case of water supply what are you going to do, cut people's water off? That['s not exactly going to play well in the press either.
I absolutely agree you will always get uproar when you start charging people for something they have previously had without an obvious charge for - as stated, people have actually been paying towards the upkeep of the water supply, they just didn't know it. But there are certain essential services that as a politician you mess with at your peril, definitely including any notion you're preparing them for privatisation, and the water supply is one of those.
True, true. But let's not assume 'privatise it' is by definition the best solution. It's simply most of our current political class's first choice.