A lot! They have tiny stomachs, so you don't need to restrict how much they're eating. When they're over a year, they can get fat. You'll need to be careful with what you feed them. But as a kitten, they may eat every couple of hours.

It's best to use a kitten replacement milk from the pet store containing more appropriate calories and nutrition for them.

They do. Every animal needs access to water. You could offer them kitten replacement milk when they're small, but they should also have access to water at all times.

There are so many commercially-made pet foods out there. It's hard to go wrong these days. If you go to the pet store, the main thing is to get kitten food until they're around six months. Beyond six months, they'll eat adult food. At about seven or eight years, they'll get a senior diet. If there are any medical issues, then your vet might recommend prescription food. The brand that I like is this one here called Rawz Canned. Also, Hills is excellent. And there are several store-bought diets that are not bad either.

Typically, a kitten would start to eat solid food at about six weeks and be fully weaned by nine weeks.