I was told no food for 8 hours before fill. No water for 4 hours before fill.
After fill, day 1 - warm liquids; day 2 - cold liquids; and day 3 - full liquids (or something close to this!)
Jena, if you've already booked OCC, and have tickets, you might consider just trying extra harder watching what you eat - there's not much time between July 12 and August 1.
Good Luck either way