There are many places in Pilsen to have a nice meal varying from fast food restaurants (McDonalds, KFC, cheap local fast food) and pubs to normal restaurants. Mostly you will find classial Czech cuisine but there are also chinese, indian or mexican restaurants. The prices of the food depend on the restaurant itself but are usualy around 100,- Kc to 200,- Kc (4 to 8 €) for a normal meal (not luxury).
Pilsen is of course the birthplace of Pilsner type beer. Beer is so cheap here that you could take a beer bath every day and still feel that you are spending almost nothing. In pubs there is literally nothing cheaper than beer (yes, even botteled water). There are many local breweries with all kinds of beer (blonde, dark, fruit flavoured). To make a long story short the beer is around 1€ for half a liter. If you are not a beer fan, don't be afraid. The soft drinks are also very cheap at least cheaper than in the western Europe.
For the lunch the university canteen will be available for the last three weeks of the workshop. During the first week (from 1st Aug to 5th Aug) the canteen will be closed due to maintenance. The food there is quite cheap (2€ at most).
Coffee, latte, cappuccino and tea will be provided directly at the project rooms.