All the above advice is good another thing you may want to try is a little "meat" baby food, it is high in calories and it is almost liquid, it also smells strong, cats need to be able to smell their food. I rescued a 5 week old in June, I had to teach him about the litter box too. Although with 4 others in the house he got the hang of it pretty quickly. Food choice is usually a personal opinion. I feed 2 cans of wet each morning and split it 8 ways, the rest of the time they eat dry. Dry food is great, it's good for their teeth and it also allows you to free feed, which is helpful if you are gone for hours or even for a weekend. Just make sure it is a good quality dry food. Your kitten if very young may have a little harder time chewing the dry food....they have teeth but they are so tiny so it maybe easier to feed the wet or maybe even let the kibble soak in some diluted baby food to soften it up a little. You will get plenty of advice but you have to chose what is best for you and your kitten right now,