There is good refreshing Weizen-beer , called Hoegaarden , or one of its many imitations. Probably, as a pilsner, Maes or Bel-pils are the best. If you like herb beers, try Poperings Hommelbier . Don't buy their vegetables. They have lots of special beers.
Fresh vegetables can be a bit pricy.
In '95 I found a box of harissa that had expired '85. Fruit and vegetables are not bad in the anonymous shop at one of the corners of the Vrijdagsmarkt . A reasonable Night-shop is Leli's World in the Corduwanierstraat. If you want to buy good wine, head for Collin . Prices around 500 bf.