For picky kittens, you can make up their formula and then mix it in with some wet kitten food until you've got a consistency like a thickshake (or a thick milkshake lol). Also, you can try soaking the dry food in hot water until it's a nice mush, letting it cool until it's luke-warm and then offering it to the kittens. You can also add the KMR to this mush.