Two weeks? I don't think fish will survive two weeks without being fed. Two days, yes, but not two week. An automatic feeder is a good choice, but make sure you test it before you just fill it and set it to go. They tend to over feed. Also, there are a lot of automatic feeders that feed twice a day. Possibly putting it on a timer so it's only powered 12 hours a day would give you one feeding a day. Without being able to water change for two weeks, you don't want bioload to build up. Putting in some no fuss plants like Java Moss might allow you to suck up some of the nutrients.