Étel
tl;dr: étel.
From formal to slang:
táplálék: most fancy, "nourishment";élelem: more official, I think the base of this is used in the wordélelmiszer, which is something like "foodstuff"; you may see this word on store signs, etc;étel: "food", this is the most common;ennivaló: "something to eat";kaya: slang;