that's the theory. Make sure you're getting a butt plug that fits, and don't push yourself too hard. Your sphincter is soft, and water and such can still go around the butt plug if your body decides it needs to vacate your colon, *now*.
I would use a soft butplug..because it adjusts beter to the body, therefor closing beter, then a harder one. And don't use to much water inside..and keep it there. Always listen to your body.
If you don't want to leak, get a bardex bulb enema nozzle. You can even put a flow-back valve in it so you can unhook it from the hose and walk around with the water inside you.