Look up "waterfalls" ... You use a socket as the bowl piece, and a half gallon jug works fine for personal. Fill it about 1/3 full and try to time it so when the bowl runes out the water runs out, and hit it. If it dosen't run out in time tilt it back to prevent the water from running out the hole and drain it later. You can use 2 jugs to recycle water so you don't gotta sit at a sink...