K-State:
Don't get so down on yourself and, more importantly, DON'T GIVE UP! I can't give you much advice for getting through the pre-op diet, b/c I don't start mine for another week (and mine isn't all liquids), but I would advise you to keep your carbs to a minimum if you MUST cheat. Low carbs are what is shrinking that fat around the liver and will help your surgeon see your stomach better to band it! So, try not to eat saltines.
You can do this! We are all here to support each other and help each other get through these hard times. If you are feeling like eating carbs, drink some Water or a Protein shake, come on here and vent!
I wish you all the luck (and willpower!) in the world!