the fish do not need to be fed every day, especially while you are away. every three days will be fine. put some food in a baggie and tell the person who is gonig to watch your fish to give them the food from 1 baggie every three days. this will ensure that they are are feeding the right ammount and that there will not be any unexpected ammoina spikes from overfeeding.
you need to find someone that you can trust to do water changes during the two weeks. if you plan it right, they should only have to do one.
have said person come over to your house two weeks before you leave and show them how to change the water. then, a week before you leave, have them change the water while you watch to make sure they do everything right.