Hello! Please share your advice. The child can't get used to kindergar…

Hello! Please share your advice. The child can't get used to kindergarten. In the afternoon they sleep through it, and they struggle to talk, give them formula. They don't eat anything in the kindergarten, only eat cookies and drink water. They constantly fuss, the grandmother-in-law manages the kindergarten, so I don't doubt about food and educators. And besides, our friends' children go to our kindergarten, and all of them go without problems. They are almost the same age. It's sad that he is constantly crying there and doesn't eat anything for the whole day. Maybe someone had this experience or should change the kindergarten, I know what to do! Tell me good and verified kindergartens