get a tray that can fit all your buckets in it and is fairly taller than the buckets, just poor ph'd nutrient formula into the tray with ur buckets in it, and fill it up about half way . its just like hydroponics, and itll take a cuple days for ur plants to completely soak up all the water, and the soil will stay moist for a matter of days as well. this will probably work in ur situation, but still try to get somebody that u trust to water em at least one more time!