The launch of the Yorkshire brewery's EU referendum range of beers is to encourage people to get involved with the debate.
Watson said: "This is by far and away the best visit I have done during the referendum campaign. A West Yorkshire brewery on a Friday afternoon, which was a joy to be at."
He took the tour of the brewery along with retired MP for the Calder Valley Chris Tarlo and Labour's candidate for Luddendenfoot, Jane Scullion.
They spoke with the brewery's founders Sue Cooper and Wim van der Spek resulting in the deputy leader pulling a pint of the 'In' beer.
Cooper said they were delighted to welcome the MP to the brewery and explained it was great to see the beers were doing exactly what they were intended to do, to urge the nation to make use of their vote when the time comes at the end of the month.
Since the range was launched in May, Cooper said they had a great response and saw a substantial demand from existing and new customers with the beers selling well in bars, pubs and shops across the UK.
Watson also said: "The vote 'In' beer is an exceptional brew and must be drunk by as many people as possible!"
This is one of three beers available, joining 'Out' and 'IDK' (I Don't Know) to help encourage debate between Britain's pubgoers and get them to take a stance on the referendum.
Cooper explained: "The EU referendum is too important for people to ignore and we wanted to get the nation talking the best way we know how, with beer!"