If you’re looking for some good Polish cuisine in Kraków, I recommend Gościnna Chata (Sławkowska 10), Kogel Mogel (Sienna 12), and Kuchnia U Babci Maliny (Sławkowska 17). All of these are inside of the city centre, so they’re quite close to some of the top craft beer bars in the city (Multi Qlti, Viva La Pinta; Weźże Krafta is also just outside of the historical centre). If you want a great Polish experience, you can have some cheap eats at a bar mleczny (milk bar)! There are dozens in the city, but some reliable ones include Smakosz (Mogilska 58), Żaczek (Czarnowiejska 75), Żak (Królewska 84), Targowy (Aleja Ignacego Daszyńskiego 19), and Smakuś (Wójtowska 2): these places all serve filling Polish soul food at fantastic prices and usually in a very casual setting.
My go-to bottle shops are Świat Piwa (Karmelicka 51) and Strefa Piwa (Krowoderska 37). There are lots of small liquor stores that either never close or are open extremely late, and even some grocery stores can have surprisingly good selections (Alpo at Kazimierza Wielkiego 1 is one such example). I’ve heard that Huta Piwa (os. Szkolne 35) is also quite good, but whenever I’m in town, I’m usually too lazy to go all the way out there when there are perfectly good options closer to where I always stay.
Also, make sure that you use OnTap.pl! There are not so many verified venues on Untappd that keep their tap lists up-to-date, but a lot of bars update them on OnTap (25 venues in Kraków and 51 in Warszawa).