THey sell Weetabix, Cornflakes Rice Crispies, cookie Crisp etc, but they also have Lucky Charms aswell as frootloops - avoid these two, they are addictive - and you can't buy them in the UK !!!
You will find there is no problem looking for food - even Heinz baked beans are in the " Ethnic section" at Publix. I have had fussy children stay with me who have all enjoyed every food there- and I love shopping over there - the very thought of PUblix gets me excited [ Yep doesn't take much, I know]