Make sure they have food, water, and that their heat lamp (if they still have one) can't be knocked over and set your house on fire. If you have a feeding tower, fill it up, fill up the water and maybe give them an extra one in case they manage to drain that one. I have a water bottle waterer (like for rodents or rabbits) in my brooder, one they can't possibly spill, but that's better left to teach them to use it when you have time. You can try putting one in if you want, maybe they will learn while you're out, but don't leave it as the only source of water. As long as they have access to food and water, they should be fine. If you're really worried, pay off a neighbor to come check on them and show them how to add food or water to the containers.