Brian, you could consider going to my competitor Easy Green, they make an auto watering unit for about $500. It’s good but I can’t support you on it. The only automatic watering system I have is the Freshlife 2000 Sprouter. However the yield would be smaller than my 3 tray Wheatgrass Grower. If you wanted to use the my Wheatgrass Grower, you could start the process as soon as you return from your trip. The most critical period for growing Wheatgrass is the first 7 days. You would need to stay around for this critical period, however you can experiment with the timing once you have grown a successful crop.