Question: Where in South Africa is Castle Lager bottled?

Context paragraphs:
Gilroy’s Brewery: Gilroy’s Brewery is a microbrewery and restaurant in Muldersdrift, Gauteng, South Africa.  The brewery was founded in 2000 by Stephen Gilroy at his pharmaceutical printing company in Roodepoort, Gauteng.  Gilroy’s Brewery was one of the first microbreweries in South Africa, along with Mitchell's Brewery, Nottingham Road Brewery, and Drayman’s Brewery.  In 2008 the operation was relocated to the current premises at Ngwenya Glass Village in Muldersdrift, where it expanded to include the restaurant, beer garden, and a gift shop.  The brewery produces 5 styles of beer – a lager, pale ale, ruby ale, and a dark ale.  The brewery has recently introduced a ginger beer.

2017 COSAFA Cup: The 2017 COSAFA Cup (known as Castle Lager COSAFA Cup South Africa 2017 for sponsorship reasons) is the 17th edition of the COSAFA Cup, an international football competition consisting of national teams of member nations of the Council of Southern Africa Football Associations (COSAFA).  It was held in South Africa from 25 June to 9 July.

2016 COSAFA Cup: The 2016 COSAFA Cup (known as Castle Lager COSAFA Cup Namibia 2016 for sponsorship reasons) was the 16th edition of the COSAFA Cup, an international football competition consisting of national teams of member nations of the Council of Southern Africa Football Associations (COSAFA).  Originally, it was to be held in Windhoek, Namibia during May 2016, however the tournament was rescheduled to avoid a clash with the South African Premier Soccer League and took place in June 2016.

Ethos Water: Ethos Water, a Starbucks subsidiary, is a brand of bottled water with a social mission of "helping children get clean water."  Ethos began in 2001 when Peter Thum had the idea after working in communities in South Africa that lacked access to clean water.  Thum, who was working as consultant for McKinsey & Company at the time, realized the potential to create a bottled water brand to raise awareness and funding for safe water programs.  The idea became an obsession for Thum, and he wrote the business plan for Ethos, left McKinsey, and moved to New York in early 2002 to start the venture.

Castle Lager: Castle Lager is a South African pale lager.  It is the flagship product of the South African Breweries and has been variously described as South Africa's national beer, akin to Carling in the United Kingdom and Budweiser in the United States.  Castle Lager was awarded in the "World's Best Bottled Lager" category at the 2000 Brewing Industry International Awards and is the official sponsor to many sporting associations within South Africa, most notably the South African Football Team and South African Cricket Team.

South African Breweries: South African Breweries (officially The South African Breweries Limited, informally SAB) is a major brewing and bottling company headquartered in Johannesburg, South Africa and was a wholly owned subsidiary of SABMiller until its interests were sold to Anheuser-Busch InBev on 10 October 2016.  South African Breweries is now a direct subsidiary of Anheuser-Busch InBev SA/NV.

Valpre: Valpre is a bottled spring water by The Coca-Cola Company available in South Africa.  The brand is bottled in two forms, "still" and "sparkling".  Coca-Cola South Africa announced on the 12 October 2009 that it will establish a new Valpre Water Bottling plant in Heidelberg, Gauteng.

Tusker Project Fame: Tusker Project Fame is an East African reality-singing competition show sponsored by Tusker Lager.  The show is similar to American Idol and Project Fame South Africa, musicians compete to win cash and a one-year record deal with Universal Music Group South Africa.

2018 COSAFA Cup: The 2018 COSAFA Cup (known as Castle Lager COSAFA Cup Botswana 2018 for sponsorship reasons) will be the 18th edition of the COSAFA Cup, an international football competition consisting of national teams of member nations of the Council of Southern Africa Football Associations (COSAFA).  It will be held in Botswana in July 2018.

South African Defence Force Ensign: The South African Defence Force Ensign was the flag used by the South African Defence Force (SADF) as a unified flag for all of the South African Defence Forces after they had previously only used their own individual flags.  It consisted of a green ensign with the flag of South Africa (known as the ""Oranje, Blanje, Blou"") in canton with a crest consisting of three symbols of the SADF forces inside an outline of the Castle of Good Hope.  The flag was adopted in 1981 but was replaced in 1994 following the adoption of a new flag and the reorganization of the armed forces in South Africa as the South African National Defence Force but was still used for a few months after.

Supporting paragraphs: Castle Lager South African Breweries
Answer: Johannesburg