Tea, tea, and more tea! Some are in malls, but first ask the price before ordering or else brace yourself for the most expensive egg-sized cup of tea in the world. You can experience different ceremonies of tea at tea houses especially in the Qianman area south of Tiananmen. These can range in price, and some tea houses are really tourist traps whose main goal is to milk you of your money, so be careful. You can get a free tea demonstration at most Tenrenfu tea houses which are located throughout the city and at some malls.
Warning: be aware of the Beijing teahouse scam, in which young Chinese people posing as students of English will try to lure foreigners into a tea-house for a demonstration of tea ceremony, leaving the foreigner with a bill running to hundreds of US dollars. Be sure to ask for prices for the tea and facilities up front before agreeing to any kind of tea ceremony.
Good coffee is hard to find in most parts of China, although addicts have a place to retreat now that Starbucks has made huge inroads with the emerging middle class. They have at least 50 Starbucks in the capital, most situated around shopping malls and in commercial districts of the city.
Chinese beer can be quite good. The most preferred beer in China is Tsing Tao ( ?10-20, 2-3 if you buy it from a street vendor) which can also be found in the States. Try Yanjing beer (?10-15 at restaurants, ?2 on the street), which is main beer brand of Beijing. It comes in very large bottles and has 4% alcohol content. (Yanjing is an antiquated name for Beijing.). Both Yanjing and Qingdao now come in "standard" (putong ) and "pure" (chunsheng) varieties. You'll also find Beijing beer in some establishments and is only served on draught. It's brewed by the Japanese beer company Asahi which probably explains why you don't see it in many places.
Great Wall is the most popular local brand of wine. Wine made in China are considered not drinkable by most foreigners, but this is probably due to the fact that it is not common among local Chinese to drink it. Giving wine as a gift is not a common custom in most places in China and most people will not be accustomed to wine etiquette or appreciation. Foreign red wines are usually of a much better quality, such as those from the US, Germany, Italy, Australia, and Chile, and you will find them at most upscale restaurants.
The most common hard liquor to get drunk from is Bai jiu (white liquor). It comes in a large variety everywhere for very cheap prices and should be avoided if you want to have a clear mind for your travels on the next day. Mao Tai is one of the more famous brands, and costs about as much as an imported bottle of whiskey. A large selection of imported liquor can be found at all bars ranging from tequila to whiskey.