There are two possible reasons why the cat vomited yellow water and died the next day:

1. The cat had foreign matter remaining in its intestines and stomach and was not removed in time. Causes necrosis of the cat’s gastrointestinal tissue. Causing membrane peritonitis. This causes the cat to vomit yellow water and die.

2. The cat itself suffers from severe kidney failure. Causes cats to have severe nitrogen hemostasis. Because of severe kidney failure, cats have abnormal gastrointestinal function. As a result, the cat vomits yellow water and causes death.

Things that need to be paid attention to when a cat has vomiting symptoms are as follows:

It depends on its mental state. If it is in good mental state or can eat, If it wants to eat, then it's not a big problem. Just continue to observe the mucous membrane or give it food. But if it keeps vomiting after vomiting, is not in a good mental state, and does not want to eat, you must take the cat to the pet hospital for examination and treatment as soon as possible.