Go beyond a few weeks of isolation and your needs become more complex. For long term survival there may not be any dentists around. Perhaps a supply of tooth brushes, floss, flouride tooth paste, oil of cloves and even a field dentistry kit aren't out of order. Prescription drugs are a peculiar issue. Do your best to talk your doctor into a substantial supply and keep it in the freezer, rotating as you use it.
Antibiotics are even more difficult.
Doctors are afraid you'll use them carelessly or cause resistant strains of bacteria to develop. The doctors are right. To use prescription antibiotics correctly requires a little study. Quiz your doctor on which antibiotic to use for what disease and do some research at the library. Make sure you understand the limitations, dosages and risks associated with them.