I think even juice-fasting, or fasting from something you do often, that would be hard to give up (media, smoking, meat or some other main course) would be good. I've found juice fasting to be effective and difficult enough to make me pray, but not excruciating, but you have to prepare a bit by eating light, mainly fruit and veggies for a couple of days prior to doing it. That's why I mentioned it this early, as it may take some time to decide and prepare for some people.
I'll bring it back up about a week prior to the debate.