Yes, you can take advantage of the free dining offer. All you need to do is buy a 1 day MYW ticket per person. The MYW ticket can be used at a later day.
Make sure to calculate the price using your AP discount with you paying for dining (no additional ticket required) and the price using the fall/winter room discount with you paying for dining (no additional ticket required). It's the only way to be sure that you're really getting the best price for comparable trips. If you'd normally eat differently than the
DDP dictates and one of the room discounts comes out much better for you then you may be better off getting the TiW card rather than buying a dining plan.