Billa

This is a nice and clean grocery store comparable to CVS or 7 – 11 in the USA. It is well lit, clean and staffed with friendly employees. This was especially helpful for replenishing travel supplies: bottled water, tissues, etc.
Salzburg is popular for Mozart chocolates — you can get those here at lower prices.

We had just been to Mirabell gardens, and we were walking over the pedestrian bridge back to the old town, and we ran directly into this place. We went in, and they have a bakery, deli, fruit, wine, and most anything you need. Me and my wife divided a slice of cheesecake, that was very good, and we grabbed a coke. My daughter grabbed a pretzel «bun», and it was good. If you don’t want to drop a lot of cash, this is a great place to stop.

conveniently stumbled upon this grocery store while looking for something to drink. now, you can go and pay 3 euros at a café for bottled water, soda, tea, whatnot. OR you can go to a supermarket and get a liter-​sized bottle for under a euro. yea, exactly.
bought myself the biggest bottle of non-​sparkling water i could find and some fruit + yogurt + bread for breakfast and it only came out to about 2 euros. this is how i was able to travel to 8 cities in 2 weeks for under $ 2000USD, airfare included.
their fruit and produce section is rather small, but what they had looked fresh. there’s rows and rows of packaged and boxed goods, a large bread and beverage section, and a smaller meat section.
checkout lines were long, but moved very fast. this is because europe is awesome. after you pay, you move to the end of the table where you can bag your items. after your items are bagged, you can move all your bags to a separate counter where you can then put away your wallet and organize your things before you leave the store. no long holdups at the checkout counter itself.
europe equals WIN.