Hi, eating fish is alright during confinement:) if you’re very worried about mercury, avoid fish like tuna and swordfish. The usual fish in confinement food is fine.
Generally, if food is cooked well with Chinese wine, the alcohol evaporates during the cooking, so it shouldn’t affect your milk.
The usual confinement food herbs are also okay for breastfeeding. Remember to drink lots of fluids in order to build up your breastmilk supply:)