Island Escape have all inclusive - we were on her sister ship Island Star in June & had a great time. Food was fantastic, staff were amazing. The entertainment was a bit week - more like a 'Red Coat' show but a lot of passengers really enjoyed it. Will definately be going again. Very informal & frinedly.
Princess have deals when you get onboard for unlimited soft drinks of coffees for a fixed price at the start of the cruise - and obviously apart from speciality dining, all the food is free.
Ask your travel agents, thats what they are paid for, some comapnies do an add on for a fee, that included an upgrade for free drinks. Don't forget tea, coffee etc is mostly free, again check.
Island Escape does a free upgrade to all inclusive if you book by certain dates via your travel agent. We went all inclusive to the Med.last september and had a fantastic deal,all drinks from all bars and as much wine as you wanted with your meals!
Try Silverseas there "all inclusive".