I decided I couldn't carry 15 gallons very easily, so I bought a 5 gallon tote on Amazon and will buy the less expensive gallons from Home Depot or 2.5 gallons from Pinch-A-Penny and transfer to 5 gallon tank from time to time.
Does anyone have a recommendation for how to weigh down the feed tube so it rests on or near bottom instead of curling up?