Думаю так:
1)If I were in Bukovyna,I would help myself to brynza. (возможно тут пропущен глагол перед "брынзой", например, "make", или вместо "to" - "with", но сути дела это не меняет)
2)If I had some dried fruit, I would make uzvar or kysil.
3)I could make kvas if I had some dried bread.
4)If you were in Poltava,you would be invited to taste Ukrainian borhch with halushky.
5)If you asked me what desert I`d like to have,I would mention about apple pie first.