We rarely make ADRs any earlier than the afternoon of, we have made a few a day before but that is rare. We just do it while walking around the parks, normally around 2 or 3 in the afternoon. We always have PHs and time or park doesn't matter to us and we love to try new places so that helps. You can actually walk up to Spice Road Tables and get a seat outside almost all the time. We have gotten, Tiffins, Mons. Paul, Sanaa, Jikos, Flying Fish all the day of. Heck we were on the bus going back to CSR and got Mayan Grill, which was one of the best meals we've had on site, for a half hour later which worked great.