I think you are thinking of the phrase  the other way around , which does essentially mean the opposite, but in a specific way. The specific nature of the other way around is that it means that doing what you say in the opposite direction is correct, not necessarily the exact opposite.
You can offer your kitten either dry food, canned food, or both. Be sure to choose food which is designed for kittens. They require a diet which is especially rich in protein, calcium, and other nutrients. Cat food that is for adults is not sufficient.
If you are wanting to wean the kittens early due to some problem with the mother cat, or the mother cat's milk supply, and you need to feed the kittens yourself they can be fed kitten replacement formula. If the mother cat is not present see the article on feeding orphan kittens.