With half board , your main meals are already included . exception of course - drinks. Wine by the glass 1/8 - 1/4 liter no need to buy a bottle if you do not wish.
Normally the house wine is Ok - 1,50 - 3 euro per glass.
Large Beer 3-4 euro You can spend as much or as little as you wish for dining.
Several 5 star hotels with good but expensive dining like Klosterbrau to inexpensive pizza places.
You can find good main entrees at several places 8- 15 euro- soup 3-5 euro
Restaurant by the Diana Hotel usually has OK food in a nice atmosphere in the pedestrian zone- midday specials can be a bargain too.
Watch the prices of pastry - these sometimes high.
If you wish to save a little - several supermarkets in the village center pedestrian zzone - great place to buy - mineral water - non alcoholic or fruit drinks - beer and wine selection also.
Selection of good sliced meats bread and rolls - fun to make a picnic for use during a mountain walk.