I am NOT a certified mechanic so take this advice with that stipulation.
I don't think that charging the battery and driving it anywhere but to the dealers is a good idea.
One problem is going to be that if the charge light is still continuing to come on, I would bet good money your alternator is not working.
Second problem is that as has been pointed out, several key systems rely on the electrical system.
Third problem is that IF the charge system is not working, you would be driving on battery power alone and the battery would almost certainly be dead when you tried to start it up to go back home.
I would say to get the car to the dealer ASAP for that scheduled appointment.
Just my two cents.
- Jon E320 210.055
77 Mustang 307,000 mi
63 T-Bird [fully restored]