The brewery tour manager, Chris Snow, said about one million litres of water was taken from the Dunedin spring by the public each year.
But access to the tap in Rattray St has been closed since Tuesday.
The tap and its surroundings were being upgraded, including the barrel it juts out from.
People had been taking the dry spell well, he said. The tap would be "pouring again" today, he said.
The work on the tap was being completed to coincide with the brewery tour getting a more than $1million facelift.
The tour upgrade began in mid-June, had been "going really well" and was expected to be complete by the end of the month.
The "fresh look and feel" includes an improved retail area, tasting bar and a new "cellar door".
The tour route would remain the same but would feature new technology and displays.
The last time the tour was improved was 2004, he said.
"It was overdue for an upgrade."
