Before treating food poisoning at home you really should see a doctor to find out how severe the food poisoning is.
If it's not too severe then about the only thing you can do is stay hydrated and replace lost fluids and electrolytes through drinking water, juice and even Pedialyte.
If the food poisoning is more severe then you may need to take some prescribed antibiotics to get rid of the food poisoning.
Most food poisoning lasts only a few days before going away but it's always a good idea to get diagnosed just to be sure.