If someone drinks water or other drinks during a meal. They do not have to say a brocha. Even if a person is drinking because they are really thirsty. Since you established a meal over bread, it exempts water and all drinks.
I'm so thirsty, I'll drink some water. I don't have to say a Brocha.
If someone drinks beer during a meal. Even though it's not to quench their thirst. They do not have to say a brocha. The bread is exempted to the beer and the beer is exempted to the bread.
I'll drink some beer, I don't have to say a brocha.
If someone is drinking something sweet during a meal, they still don't have to say a bracha.
I'll drink some lemonade, I don't have to say a brocha.