I would usually say water and/or black coffee but that may be rough at 2am if you want to go to bed shortly thereafter.
Not sure how long you’ve been IF, but during my first few weeks of 16:8, I felt intense hunger toward the end of the fasting window. Then, I just stopped feeling it. My body adjusted to the schedule.
I push my fasts longer now, and when I do start to feel hungry, I focus on that sensation using some mindfulness techniques. I’m by no means an expert, but it has helped me reconcile and overcome hunger that arises outside of my desired eating window.