Eheim's auto feeder is supposed to be pretty good. Just don't use the ones that dissolve IMO they aren't the best and can murk up the water pretty quick. Personally I'd see if a neighbor or something could come over every couple of days, not necessarily to feed (if you don't find an auto feeder that works then yes to feed) but to make sure that everything is still working and you haven't lost any fish due to something unforseen (fighting, ich, something random)