You can pretty much eat everything when you breastfeed, but at the same time in moderation.
Too much sweet/salty/oily food can cause milk ducts to be clogged and leading to mastitis.
For supply wise, try to drink more water/soup, can consider eating more nuts/fish. Most importantly, eat well and don’t starve/undereat. For alcohol and caffeine, best to consume after latching/pump so that it has at least two hours before the next session 😊.