Not much info in the BikeReg notes either. Doesn't sound like theres any rest stops. Only mention food/drink at finish.

Natchez Libre is a mixed surface event with something for everyone. We have a 38 & 70 mi course of 75% Gravel and a road ride with a 40 & 60 mi routes. There's even a 14mi option for beginners.
Awards will be given to top male and female in the gravel ride as well as age groups. There will be food and refreshments at the finish. Very scenic and low traffic roads in the Natchez State Park.