Yes, polish beer usually have more alcohol than a western ones. But you can buy Zywiec, Warka, Tyskie or Lech - it's no matter - a taste is always the same

Ptasie mleczko is.. eh.. quite similiar to Milky Way but filling is more fluffy and ee.. 'schmackhafter'.

Kamyki brzeskie aren't salted, so don't worry

You could looking around for pierogi ruskie from Nordis for example. But you have to remember that my homemade pierogis are a lot, lot better than any commercial ones