sorry for your loss.
mushrooms are risky. cut 1 stem and see what colour or liquid they have. poisoned mushrooms usually have dark liquid with a strong smell. if you post a pic someone might tell you what kind of mushroom they are.
watermelon is good if not full of pesticides.
my friend's toddler ended up in hospital after eating watermelon. the doctor said too many pesticides for such a small body.
I have 2 sick birds - some kind of poisoning. I have just remembered I gave them some fish a few days ago. fish is ok. BUT I could feel the smell of fish the next day and it is already hot here. just crossed my mind that maybe they didn't eat all the first day and although I didn't see any fish...