We found a place a couple of klicks from support site that sells the demijohn bottles. This guy has TONS of them in all sizes and different colors. And, he speaks english. The prices arent bad, cheaper then the ones being sold at the nex. The owner is Luigi Falcone. The address is:
Via Roma Teverola in Gricinano Aversa. street address is 110. Tell him the guy from Texas sent you.