Does my cat need to be fasted for surgery?

I'd say, most times, they do. And they will give you specific instructions on that. So water is usually fine, but food is not.

Yes, ideally your cat should be fasted for surgery. This means no food after around eight or nine o'clock at night, and none in the morning. The one exception is for giving your cat its calming medication. We allow a small amount of canned food or a Churu or squeeze-up to encourage them to take their medication. Aside from this, your cat should not have any big meals. However, your cat should have access to water, as it's important that they stay hydrated.