This happens for various reasons. Let's look at the most popular ones.
It's not that easy to get rid of them. Even the most domestic cat has them.
The fact is that in the past, wild cats had to get not only food, but also water, and to do this, they had to clear the area of leaves or branches in order to calmly quench their thirst.
A kitten, when still very small, gets used to kneading the cat's belly to get more milk. This instinct is especially pronounced in those animals that were weaned early from their mother.
The liquid should be clean and fresh. The bowl should also be washed. After all, cats are very clean creatures.
There should also be no food nearby. The animal may decide that the water is spoiled.
They have scent glands on their paw pads, so a cat can mark its territory if it doesn't want other animals to come near.