Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
Typically - what we are seeing here is stomach upset and nausea - and it would be uncommon to be anything worse.
Therapies to consider include:
A bland diet:
A common bland diet is boiled white rice and either boiled white meat chicken or boiled hamburger. Whichever protein source is chosen (chicken or hamburger) it is recommended to offer a mixture of 2/3 rice and 1/3 of the protein source.
Antacids for stomach upset can be used as well - Famotidine (Pepcid A/C) - LINK HERE is a common example.
Monitor for loss of appetite more than 24 hours, vomiting, or diarrhea.
But in most cases this is not serious at all and mild stomach upset alone.
It has been about 18 hours and he still has not drank anything
He won't put anything in his mouth
You can try to offer small amounts of pedialyte for hydration and electrolytes (LINK HERE). You can even purchase a dropper from your local pharmacy to offer the water/pedialyte mixture by mouth.
Do you think this could be fatal?
It would be extremely unlikely if just the soup
Thank you . . . I hope it was just the soup
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I will give him Pedia