There will be an aid station setups with water, most likely assorted gu products, and other snacks to keep you going.
In general though, most people rely on their own stash in the feedzone. Everyone has different preferences and tolerances, so its a good idea to figure out what works best for you ahead of time and have that prepared. Most racers will bring a cooler with prefilled bottles or extra bladders/jugs of water to refill their camelbacks. While you can certainly refill at the aid station, in a lap race like this most use it to just grab a quick cup of fluids or snack and make their bigger stops at the feedzone area.