I think that Zubrowka sucks ass, but it is possible that I drank the "fake" Zubrowka, since the real one is outlawed in the USA because of the poisonous Bison Grass.
Bison grass IS NOT poisonous. I'd be dead long ago if it was.
Aren't all top shelf vodkas made strictly out of wheat nowadays?
No. There are lots of potato vodkas, and the French just forced through a rule in the EU that says you can even make it out of your grandfather's dirty socks, just as long as you put some note about it on the label. Apparently they want to sell fruit distillates as vodka, but if you ask me they're trying to find ways to utilize overripe brie.
Polish vodkas are made either out of potatoes or rye - I don't think there are any wheat vodkas around.