Field school in Colombia

Hey all! Ok so I'm heading off to my first field school this summer in Colombia. Its really remote, three day hike up a mountain to get to the site remote, so I'm gonna have to carry everything I need for the month with me. I've backpacked quite a bit, mostly short trips though, nothing over a week. Beyond clothes and ten gallons of DEET, anything y'all would recommend? Please keep in mind weight is a major consideration and I won't have access to regular power sources (might bring a solar charger to charge an mp3 player/camera battery). Max recommended pack weight for a woman my size is around 35 pounds. Are snacks worth hauling in? Instant coffee packets? Duct tape? Anyone else worked in these kinds of conditions before? All advice gratefully accepted :)