Water is essential for hydration, especially in warm weather. Raingear and snacks often will come in quite handy. Insect repellent and sunscreen are always a good idea. Many trail users and maintainers will wear permethrin impregnated clothing for insect protection, and it is always a good idea to do a tick check after being on the trail. If you are going out alone, you should tell someone where you are going to be and how long you expect to be on the trail.
