As others have said, P&O prices are really reasonable. We came back from Ventura last month and as a family of 4 (well one is a baby) we didn't spend more than about 35 a day in total - excluding trips. However, we tend to drink teas/coffee/water during the day. You can get bottles of wine from 10 upwards, and cocktails of the day are 2.65, with bottles of bitter around 2.60 - all very reasonable. We also had a bottle of gin in our cabin (available for 12.50) and had a pre-dinner drink after dropping the children off at club while we got ready for dinner.