I've never given something like this a lot of thought, and I'm not sure exactly what you'd plan for your liquid diet to encompass. Would it include certain diet drinks, various juices or broths? Or just the meal replacements and nothing else? And what kind of meal replacement drinks are you thinking about?
What I can tell you is that I drink smoothies every single day, which I guess you could consider "liquid." At this point I blend whole fruits and sometimes veggies with plain yogurt, flax, nuts, and sometimes cranberry juice. I've thought about adding some kind of protein powder so they can be an actual meal replacement rather than a "supplement" when I'm on the go, but haven't looked into it yet.
If you're thinking about a liquid diet, maybe something like these smoothies would help you as a transition, either on the way in it or out? Or maybe they could be a part of the diet itself? In my case, I just love how I can have my healthy, nutritious fruit every day without actually having to "eat" any (the flavor of real fruit tends to be too intense for me), plus they taste great and are extremely satisfying.
Anyway, hope this helps. Good luck with whatever you go with!