My bf's sister got yoda (6 months old) a bag of kitten food when we saw her at christmas, and now that that has run out, we've gotten yoda the regular grocery store brand that we've been feeding him. he has been scratching at his food bowl and hardly eating, but he is drinking water. how can i get him to eat again? or is he just used to the better food and it'll take a few days for him to decide he should eat this kind? we can't really afford to buy him the premium food from now on.