If so much our food contains water, why do we feel thirsty even after eating food?

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We just need more water than it can provide. We have fairly dilute urine. There are other animals can rely on a higher percentage of water from food, some with more concentrated urine than us, we lose a lot of water.

Food not only contains water, but breaking down the sugars using cellular respiration also creates more water as a byproduct, adding another small percentage. It’s just a small percentage of our overall water, so we need to drink, but some animals do use it as an important water source. I can’t remember which ones, maybe some arid species.