The dining package is an add on to a room & ticket package. To get the dining, you have to reserve an on-site room and you also have to buy some type of MYW ticket for everyone in the room. It could be a 1 day MYW ticket though (even if you are staying longer than that).
Once you have the room & ticket package, you can add on the dining package. You have to purchase the dining package for everyone in the room and it has to be for the entire length of your stay. The dining add on is $35 per adult (ages 10 and older) and $10 per child (ages 3 - 9).
HTH.
Best wishes-