soak the shit outta your plant before you leave.. even consider setting the pot in a bucket of water for 30 minutes.. as long as the water does not come over the top....

If your plant is less than 3 weeks old and your grow container is at least 3 gallons and the temperature does not go over 78 farenheit.. you should be OK...

How often are you watering now?
Are you saturating the soil with each watering?