Czechs usually ask question in negative form. For this reason, I think one of the acceptable answers shall be: "Do you eat bread?"
No, that is not true. Czechs use negative questions when offering something politely, but that is not happening here.
OK. Then one more question: Is "Don't you eat bread?" another answer or isn't it accepted? If not, why?
"Ty" is not necessary but you can add it if you want to put more emphasis on it
I thought i and y sounded the same. But here the woman pronounce this strangely. How do you say ty?