I'm flushing today too but it's my first time so I can't give you any concrete advice. But, I ate a little bit of oatmeal for breakfast, some Watermelon mid-morning, and just had a bowel of beans for lunch. That's it for me as far as food goes. According to my flush protocol I can have no food after 1:30, which is now.
Good luck tonight. Please report back how everything went tomorrow. I will do the same.