in other words hand water couple times a day. 4 gallons of water should put you just about at the bottom of the basket. As Cig stated hand water till the roots have made their way down through the Tron to the water. Once they reach the water they know what to do

Panda film (plastic looking crap that is black on 1 side and white on other) works really well in place of that foil if you have some laying around.