Germany's third largest drink holding company Brau und Brunnen has reported a net loss of €17.7m (US$17.3m) for the first half of 2002, a 13.2% year-on-year decrease, the company said yesterday, despite rising production levels.   The company produced 5.9m hectolitres in the period a 3.1% rise on last year, including 3.6m hectolitres of beer, a 5.3% increase.