Celebrity most definitely doesn't do the "four drinks voucher" regime for Diamonds/Elites. I am Diamond on RCI and sailed on Celebrity Solstice last month. The 5-7pm free drinks was really frustrating. For a few days I could get sparkling water as a "drink" then suddenly it was "no, that's not included, only still water is included.". And woe betide the Diamond/Elite who was 3min late to a bar - at 7.03pm I was charged for a bottle of still water! I actually visited the Loyalty Desk on the last day to pass on my feedback in person. I also pointed out that because "free drinks" were only available from bars (and not in the restaurants) I had to wander the ship, drink in hand, looking like a lush!! The 5-7pm rule also means, too, that if you want a drink for eg lunch tomorrow, you need to stockpile and return to your cabin with your stash! All just very silly (but necessary) I thought.