I have this custom water jug, its almost 1 gallon, and I have a 3.5 ft. tube with a barb fitting glued into the cap of the huge water holder, so I just put the tube in the back pots an turn the container over and water those big boys.. it works pretty well, but it's hard doing the math cuz my contained is 3.25 liters and not 1 gallon like my nutes are converted too, so it's a little of a pain but fuck it i dont even really care.