I do also cut off the handle of toothbrush and get a small toothpaste from my dentist. No mirror, I have one in my compass. This is some of the smart reduction you can make. It is the carbohydrate you need, the fat is on the body. On trails like that you will always lose weight.
Tea bags are very light - much lighter than hot chocolate.
If you are looking for a hot drink tea can be just as satisfying. Replace some of your hot chocolate with tea. Experiment with some of the many different varieties available. Carry one inexpensive Handi Wipe for a hand or face towel. They're available in most grocery stores, absorbent, dry quickly and are easy to rinse clean.