Hey HW great to see you again. Good luck on your current cleanse.
Yes, you cannot have three bites, or even one bite, of anything on the MC. Once you take a bite of anything, you're no longer doing the Master-Cleanse but just your own low-calorie diet. Plus, it is a big mistake to take a bite of anything since you're starting up the old digestive system and the appetite. During my first MC, I had such an urge to chew that I did chew some cardboard, but I certainly don't recommend that!