I think they would be fine for a few days if they are outside and have water. You could put food out if it drys they may still eat it, they eat dry stuff in the wild.
I have gone away for the weekend (3 days) I feed mine right before I leave and then when I return, mine also have lots of food in there pens so they munch on that. Just make sure they have plenty of water! I have a neighbor stop by and fill up the water dishes, they don't have to know much to fill water bowls.