Thanks for the replies including the suggestion to purchase the Refreshment pack so we don't use our D vouchers for OJ and bottled water. That being said I understand that the decision to purchase the DBP depends on how much one expects to drink, type of drink the price of the package itself. What I'm wondering is whether or not Royal will sell me a single package after I tell them we only need one because we plan to pool our diamond vouchers. I have read that when people phone in for a single package purchase the reason given is usually that the partner/spouse doesn't drink. In this case we both drink but are simply trying to save the cost of one DBP by combining our D vouchers.
I think in the end we will probably end up purchasing a Refreshment package, using our D vouchers and budgeting for a few extra drinks through the cruise.