Cheryl, what kind of potting mix did you use? Not all potting mixes are created equal. Did you use lots of drainage holes?
Also, your jugs don't look like they contain much soil. How deep was it? I always shoot for at least 3" deep, preferably 4". Deeper soil will both retain more moisture in hot weather and drain better due to perched water table.
If they're just a little dry, I just spray with a fine, misty spray from the hose. If they're very dry, I bottom water in this big tub. (These coleus were propagated by cuttings, not seeds)
Karen