I am taking half of a carnation instant breakfast drink and thinning it out with fat free milk. All together I am drinking 11 ounces at a time. Is this too much?

I think it all depends on how quickly you drink it. As long as you aren't chugging it and you're just sipping it, you're fine. I have a drink in my hand almost all day long with no problems.

I can drink pretty much the same amount I did preband, just obviously not as fast. Although, I have caught myself chugging things when I'm thirsty and it doesn't hurt but I still don't try it purposely just in case I damage something.