It is good you will be boarding them 2 weeks is a long time. Depending on the age the food won't be a huge issue BD do go a while some times with out food in the wild. But water would be a issue I wouldn't do more then 4 days and that is with leaving water in the enclosure(but ours normally spill it after a few days)
As for keeping them from getting stressed your best choice would be take their enclosures with them so everything feels normal. They will know a different person is feeding them but that shouldn't stress them too much.
Thank you for the advice to bring their tanks, and they will get daily food and water. I'm just worried they won't know where they are and they'll miss me.