DIY Porta-Potty (Update)

(Link). I guess they didn't like my linking to the photo. But basically, it is a 5-gallon plastic bucket (like you can get at Home Depot--obviously it doesn't need to be food grade!). You take one of the foam pool noodles and split it length wise so it will fit over the rim, which (a) provides a seat and (b) holds the bag liner in place. Finally, they had fitted a roll of toilet paper over the carry handle so it acted as a dispenser.