If you run out of granulated sugar, you can simply substitute packed, light brown sugar at a 1:1 ratio! For those of you who don't have a degree in chemistry or physics, that means 1 cup of one equals 1 cup of the other.
This is a tip for those who might run where giant swarms of gnats sometimes loiter by the side of the road. This tip stems from a run on the Mayan Riviera in Mexico, but I've encountered swarms of gnats in Virginia and Kentucky as well. After your run, always stop and look in a mirror before going into public. Otherwise, you might actually complete a transaction at the resort store and greet five people before realizing you have up to 15 gnats stuck to your face and neck.