Buy the Cascade Designs Therm-a-Rest Luxury LE as your sleeping pad. It's $100 from REI, but it's one of the most comfortable sleeping pads out there. Get a patch kit, too (although, even if it goes flat, you still have cushioning). Plus it compacts down fairly well for travel.
For your battery charger I'd recommend the Universal Solar Battery Charger from Sundance Solar (www.sundancesolar.com), a basic charger that sells for $20. It charges AAA, AA, C, and D batteries. Get two or three of these units.
Now I'm thinking you'll surely have potable water, no? But, just in case, get an MSR WaterWorks EX ($140; www.msrcorp.com) to filter your water. Get an extra filter cartridge and a maintenance kit. Also get two or three bottles of SweetWater ViralStop ($9 each from REI.com) to kill viruses that the filter doesn't catch.
What else? That's a tough one. Some good sun wear, such as an Ex Officio Baja Lite shirt ($79; www.exofficio.com) and some Gramicci Qwik Dry Shorts ($38; www.gramicci.com). A pair or two of Teva Cross-Terra sandals ($50; www.teva.com) might be worthwhile, as will some good sunglasses like the all-around Julbo Reflex ($89; www.rei.com). Consider also a Freeplay Summit Radio ($99; www.rei.com), a wind-up or solar-powered radio, so you can keep up with world events!
Anyway, good luck. Send a postcardand that coconut.