I was buying pure water at £1.50 per 25ltrs as I live in a flat 12 floors up. It was getting expensive so I buy a Merlin RO, DI, etc, etc.
I get it all plumbed in the kitchen in a cupboard over the sink and resign myself to carrying barrels up and down each evening.
I use it for one night and the next day a bloke from Southern Water calls to arrange a date to fit a meter as every flat in the block is going on one. I could have head butted the wall.
Two days later, I have a water meter.
I'm under no legal obligation to pay according to the reading on the water meter and can carry on paying the same as before it was fitted. The problem is that there's an exclusion to that law, if I use an RO system then they can force me to pay according to the meter. As they can read the meter from outside my flat, I'm basically stuffed because they will know from the amount of water I'm using etc etc etc.
So, I'm using the tap in the car park which is out the way and right next to my (paid for) parking space and I resign myself to getting bored witless for a few hours each evening filling up 200lts worth.
I use that for one evening and the next day........ a letter arrives saying the council will be replacing the large boiler that provides the hot water and heating for the block. The tap is on the side of the boiler room. On March 19th, the work starts so after that, I'll be paying for metered water.

I'm trying to find a garage to rent that has a water supply but I don't hold out much hope.