Here is a good resource for you regarding cost of living and traveling in Poland. It has a good list including fast food, restaurants, buses/trams, beer, wine, groceries etc.
http://www.ih.com.pl/living_in_poland.php Check out the list of website resources at the bottom of the page too for further reading.
Please take a look at
this discussion regarding travel to Poland on the Polish Culture forum - great advice. I'm sure you'll find it useful. <img src="/images/graemlins/smile.gif" alt="" />
Have fun!