You start Day 33 already out in the field near Mule Point, with you and Delilah discussing the day's mission — pick up provisions from the Thorofare Supply Drop (found at the north end of the map).
Simply work your way north to this point, climbing your rappelling ropes where necessary and talking with Delilah about … well, super personal things. Take the Two Forks provisions. You're also able to take the other lookouts' supplies as well, though Delilah asks you not to. Once you've got the goods, radio her to end the day.