Who generally makes the meals? Just one individual? Are the duties shared (Husband cooks dinner and wife cooks supper)?
Most common is that women are making dinners and breakfasts, suppers are often made by men. There is also such custom us 'cook doesn't wash up dishes' - so men also usually do this. During weekends men are making also breakfasts, and there is no problem with after dinner dishes as we usually eat at parents places.
Of course it isn't a 'must be', it differs in each house.
What type of food items are typical for each meal?
*breakfast: white bread, ham, tomato, cucumber, white cheese, "Philadelphia" style cheese ("Ostrowia" 10x better ;), juice
*second breakfast (in work): sandwich made earlier in home,
*dinner: piece of meat (chicken, beef) or fish (salmon), some vegetables (carrots, French bean, pea) and sometimes potatoes or rice, or pasta.
*supper: like breakfast
PS. Milk soup is awful, only cereals!