Yes, add herbal teas, and lots and lots and lots of water. In addition, you can add hot veggie and fruit broths for those difficult moments. Purists don't go for the broths but I have found they have been a real fast saver. I'd rather drink the hot broths than do something foolish and ruin the fast...
So, yeah,
1. water
2. juices
3. herbal teas (and hot lemon or lime tea with cayenne pepper)
4. broths
in this order of consumption... drink more waters than juices, more juices than teas and more herbal teas than broths. Broths are great to get to those minerals hidden deep within the pulp fiber. Finally Faith, another experienced faster, has a terrific mineral broth recipe. I'll ask him to share it.
It gives me tremendous joy to help people better their health and lives. There is nothing that gives me a better high (except a juice fast) than to see someone succeed and be so much better for it.