Stay hydrated; drink two hours before your run, then or every hour during the race. Unfortunately Spartan Race is famous for being stingy with water (one station in 2012 and 4 stations in 2013 for the Beast) You’ll need more water during high humidity and hot temperatures.
Energy/ fuel; have some energy bars/ gel to eat during the race. In 2013 Spartan Beast there was a banana stand but by the time we got there there was no banana left!