Dead alternator???
NO worries, read on....
Option 1;
travel with a buddy, and use his car to charge the batteries alterativley, swapping them when getting low.
Option 2;
carry about 4 fully charged batteries with you and swap them out accordingly.
Now, be sure to have the stereo off, limit use of wipers, lights(incl blinkers and brakes), not use power windows, etc...
Most batteries have a reserve capacity of approx 1hr, with lights and wipers on, so if you limit use of electrics, and have a couple on standby, shouldnt be a problem.
See you tomorrow