One of the great joys of Munich is finding places were the local food and drinks are cheap and delicious. There are many places where you can eat and drink for less than 10 euros but discovering them is the trick. You should start with the local butchers shop.
In almost every Metzgerei (butcher's shop) you can get "Warmer Leberkas" to eat there. A 100 gram portion with mustard and a roll costs a few euros. Another good snack is a "Wurstsemmel" (sliced sausage meat on a roll) or a "Schinkensemmel" (sliced ham on a roll). Many butcher's shops have small stand-up tables where you can eat your Leberkas or other snacks.
There are snack bars in most of the downtown S- and U-Bahn stations, in the large stores and in the central Pedestrian area; also in the streets around the Main Train Station and in the university districts. Very popular as well is the Viktualienmarkt. On a sunny day, nothing can compare to the outdoor snack shops and the beer garden here. In fact, the Viktualienmarkt is one of the most colorful spots in Munich. Try the Schweinswurstl, or the Weisswurst at one of the serving booths. Or have a bowl of hot soup at the Münchner Suppenküche. If you're in the mood for fish, get a "Fischsemmel" at the Nordseefischhalle. Or try "Apfelstrudel" or Schmalznudel - Bavaria's equivalent of the doughnut.
Few things are as delightful as a Munich beer garden on a beautiful warm day. The beer gardens are generally open from late spring to the middle of autumn. It is very acceptable to bring your own food. Or you can get things to eat there: fish grilled on an open fire, chicken, spare-ribs. Draught beer ("vom Fass") is the cheapest and the freshest. Pils-type beers often come bottled and are more expensive. If you don't want beer try "Spezi" (half cola and half lemonade), or order "Apfelsaft" (apple juice).
Don’t miss trying a Gaststätte. It is not only a restaurant but is also a place where people go to meet their friends in the evening, to drink beer, and play cards. It seems that every street has a Gaststätte. It is perfectly acceptable and normal to have just a beer here (outside lunch and dinner hours). The menu of every Gaststätte is posted in a little glass box outside the door with prices.
Coffee lovers can appease their craving at several chains of stand-up coffee shops. Better still, stop at one of the street outdoor cafes and watch the passing crowds. This is not exactly cheap but you can stay for hours and enjoy the scene. Or visit a Café-Konditorei (café with pastry shop). They vary in class and style from the magnificent downtown cake-palaces to the simple neighborhood cafe. Try Prinzregententorte, a Munich specialty (thin alternate layers of cake and chocolate filling). Coffee is served by the cup and by the portion. A portion contains two cups.