Most indoor plants are pretty resilient, and left unattended for a week or less, they’ll do just fine if you water them thoroughly before you leave and make sure they have adequate light. If you plan to be away longer than a week, you should make arrangements for a friend or neighbor to water the plants. Make sure that you pick someone that knows how to care for plants.
If that’s not possible, here’s another option. You can create a slow release watering device for each plant by using plastic soda bottles.
Clean a bottle for each plant, and try to match the size of the bottle to the size of the plant.
Fill the bottles with water, but before you screw on the caps, drill one or two very small holes in them.
Then just before you leave, turn the bottle upside down, and bury it into the soil of each plant container.