[Bonny]

I don't know how anyone can determine from what or where they got food poisoning from.
This is from The Mayo Clinic. There are many reliable sources saying pretty much the same thing.
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Food poisoning symptoms vary with the source of contamination. Most types of food poisoning cause one or more of the following signs and symptoms:

Nausea
Vomiting
Watery diarrhea
Abdominal pain and cramps
Fever
Signs and symptoms may start within hours after eating the contaminated food, or they may begin days or even weeks later. Sickness caused by food poisoning generally lasts from a few hours to several days.