How can you project with any certainty? Is your drink unique? If so, then you have nothing to project against.
If your product is competitive with others, then you still can't accurately project because you don't have any distribution yet (the X factor).
Any investor worth their salt will know this and then go on their gut (Taste, look, marketing plan, "aha" factor) of your product and take it from there.
My point is, don't rely on projections because investor's don't. If you must, project very modestly, say 100,000 cases in the first year, then surprise.
Have a marketing strategy, a product that tastes good, catch a few breaks and take it to em.
I am also a startup. However, I have no cash to waste on marketing companies and industry advisors. I'm just goin with my gut and relying on the intelligence of my consumer (read: no b.s. claims from my company). It's working.
Inko (The white tea guy)
Ubiquity: Thy name is Inko.