The correct sentence is: How much bread do you have? 'Bread' is an uncountable noun. 'Much' is used with uncountable nouns. 'Many' is used with countable nouns. You can say: How many loaves of bread do you have? 'Loaf' is countable. 'Loaves' is the plural form.

I have some questions about Uk49s Lunchtime Lottery. I am telling this question in this thread. These questions are given below: 1. What is the most common winning numbers? 2. How to participate in Uk49s lunchtime Lottery? 3. Is It Legit to play or not? 4. Is This site https://uk49sresults.org/lunchtime-results/ provide real results of Uk49s Lunchtime Lottery? If someone has information has Uk49s Lottery tell me below. I am very confused.

The first one is right, because bread is an uncountable noun.

Bread in uncountable. In the singular we would say a piece of bread of a loaf of bread. So it is possible to ask: How many pieces of bread or How many loaves of bread. But generally we ask how much bread?