Whether you be a poor Plebeian, or a rich Patrician you get fed. The consul actually care about their people so they provide free rice for those that don’t have any food because they are to poor to buy their own food.
If you’re a Patrician, you would host regular diner parties with your friends and family. when you do attend a diner party, you should follow the proper rules, yes there are rules for how you eat your food. These rules include lying on your left arm while you eat food with your right.
Now the menu, perhaps you would like a dish of flamingo tongue, or maybe a dormouse dipped in honey and then rolled in poppy seeds, delicious. Then your drink menu is just wine or water, thirst quenching.

The plebeians however, didn’t host their own diner parties, or eat any flamingo tongue, no, for breakfast they had a porridge like food called puls, lunch was bread and wine, and diner is usually vegies and wine, sometimes having a little meat as a treat.