Water thoroughly before leaving
Move plants out of direct sun
Group plants together to slow drying
Use self-watering pots
Place pots on capillary mats
Set up a drip irrigation system
Use a water reservoir with wicks
Fill a bathtub or sink for small potted plants
Use water globes or spikes
Ask a neighbor or friend to water them
Hire a plant-sitting service
Use mulch on top of soil to reduce evaporation
Trim dead leaves to reduce water use
Check that pots have proper drainage
Test any watering setup before leaving