How To Know If Kitten Is Hungry?

I have a 5 month old calico girl. She was born with her eyes closed but they are open now. They seem to be able to move around when she is blinking, but not much else. I am trying to figure out how many times in the day she would get food and if it works better for me to do this at different times or just feed her every 8 hours like recommended? I also read that you should change their water about twice a week so does changing your cat’s litter box too once a week work well with the feeding schedule? What does everyone else do for food and water bowls? Any suggestions on what type of cat food based on weight would work best for my kitten?”