Beverage package...only you can answer that. And only you can answer which package. Have you looked at them? Do you have questions? The packages (other than water where it's actually there in your cabin waiting for you) aren't meant to be shared, but each person in the cabin can order or not order one, and can get the package that makes sense for them.
Going forward DS and I will have a water package and we'll just pay as we go for what we want. DH still loves the "get whatever he wants" feel of the Replenish package, so he'll get that. Even though he doesn't get his money's worth from it.
What ports are you going to? Have you looked at the excursions? Have you cruised before? Are you comfortable heading out on your own which requires that you make SURE you are back to the ship well before all-aboard time (otherwise, as the captain or cruise director will say, be sure to have your camera so you can get good pictures of the ship as it leaves you behind)?