Once they are over their initial shock of changing homes, I've found caapi (well cielo variety anyway) to be nearly bulletproof, and in your environment you'll probably have to watch that they don't get out of hand.
If left in pots in the same spot on the ground they will root straight through the drain holes and put out amazing growth once they do. The roots stay shallow, but can travel quite far. The soil here is basically just plain sand and I find I never have to fertilize them once the roots hit the soil. If strictly in the pot, then yes they will need some ferts, but they don't seem too picky about soil mixes either IME.
In Ecuador the locals just take a section of vine with a node or two and stick it in the ground at an angle. Very shortly therafter a shoot will start and can easily reach six feet in just a few months. In the proper environment caapi is very easy to cultivate and you are in an IDEAL environment. (Two acres on Maui? I'm insanely jealous...)
Good luck and let those babies rock!