I’m gearing up for Phong Nha jungle trekking-what essentials should I pack for a two-day trek? I already have a sturdy backpack, lightweight rain jacket, and headlamp. Should I bring a hammock or mosquito net? How much food and water is necessary, and are there refill points on the trail? Any clothing tips-quick-dry vs cotton? What about first aid, insect repellent, and waterproof covers for electronics? I want to be prepared without overpacking.