All inclusive package

I was reading in the site but it is not very clear how the system with all-inclusive package works in Fred Olsen Cruises. Can you help me please?

Hi Capt_Drake,

What is included in their All Inclusive Package:
In the bars
Selection of soft drinks by the glass; Post mix Pepsi, lemonade, tonic water, juices and mineral/spring water.
Selected red and white house wines by the glass.
Selected branded beers in cans or on draught.
House spirits : white rum, gin, vodka, whisky, brandy.
In the restaurants & buffet areas
Selection of soft drinks, mineral/spring water & juices by the glass.
Selected red and white house wines by the glass.
Selected branded canned beer(s).
Regular tea & coffee
Premium drinks are discounted too:
50% discount off premium & branded drinks, red and white wines (not Champagne or sparkling wine), cocktails, bottled water (cabin or public areas).
Their All Inclusive Package prices start at £10 per person, per night. Festive Sailings, Speciality Sailings and Mini-Cruises are charged at £29pppn (though this must be booked at least five days prior to your cruise departure date). If you wait until you're on board, the upgrade is charged at £20 or £39 per person, per night depending on the cruise; it is not available to book once on board Mini-Cruises.