In my opinion, it seems unlikely that fire bans would cause a problem for you. With all the snow and rain this winter bringing an end to drought conditions, the California fire danger should be lower than it has been in years. Certainly, there is the off chance that the section you are in has a fire ban, due to some anomalous conditions, but that seems fairly unlikely to me. Were this to happen, you would just have to get by on whatever uncooked food and no cook food you have. Shouldn't be a problem.