In MBN use saltines and bottled water as well.
You are not allowed to be drinking alcohol or smoking beforehand either. I don't think they're going to boot you if you are at a tent for a beer or two before judging but if you show up at the judging tent with a beer in hand or impaired they will likely not let you judge. Smoking Cigarettes also jacks up your taste buds and is looked down on.
I personally don't even like to use the saltines because of the sodium content.
Slab Yo Mama BBQ Team : Memphis, TN - "Slow Smoked & Whiskey Bent Since 2003"