An empty plastic gallon container...the kind the milk comes in. You know you have one around the house. Check the recycling...call a neighbor. Rinse it out and fill it up with water. Put the lid back on tightly. You are ready to go!! Sometimes we have to make due with whatever we have on hand. No excuses, RIGHT?! FYI: A gallon of water weighs approximately 8 pounds...and we can do a LOT with 8 pounds. Here is the video breakdown: