I never put moisturiser on my body. If your skin is dry on the outside, it's because there aren't enough oils coming from the inside. Moisturiser offers only a skim of moisture but doesn't solve the problem.
I do, however, cover myself head to foot in almond oil (ask a chemist) as soon as I have towelled myself off after a shower, when I'm still a bit damp. This traps a bit of moisture against the skin.
To get more oils and nutrients coming through from the inside to the skin, which is the only way to cure the problem, eat walnuts and lots of oily fish full of fatty acids like sandines and mackerel, and use extra virgin olive oil. Wholemeal bread, cereals and brazil nuts will give you Selenium which combats the affects of the sun, although this would work better prior to your holiday.
Green tea is fantastic for the skin as is, of cause, water. Think what watering a droopy plant does to it.
To sort out your dry skin quickly, I would start taking flax oil (ask chemist)every day. You need to take quite a bit of it....maybe four capsules a day....but you will be amazed at what it does.
If I were you, I wouldn't spend money on the wax polish, I'd spend it on the fuel.