Learn Farsi: برات نون خریدم.

In spoken Farsi, it is very common to attach a pronoun ending directly to the preposition برای. Here, the second-person singular ending ت is attached to برا, making برات. You will hear this constantly in everyday conversation instead of the more formal برای تو.

I learned that bread is نان. Why is it spelled and pronounced as نون here?

In colloquial spoken Farsi, the long "a" sound often changes to a "u" (oo) sound when it comes right before the letters "n" or "m". So, نان becomes نون, just like باران (rain) becomes بارون.

Why isn't there a را or رو after the word for bread?

The object marker را (or its spoken form رو) is only used for specific, definite direct objects, like when you want to say "I bought THE bread." Because you are just saying "I bought bread" in a general sense, no object marker is needed.

Can I change the word order and say نون برات خریدم instead?

Yes, you can! In casual speech, Farsi word order is quite flexible. نون برات خریدم places a little more emphasis on the bread ("Bread is what I bought for you"), while برات نون خریدم slightly emphasizes that it was done for you. Both are perfectly natural and common.