I would strongly recommend against doing this; a meal replacement shake designed by one guy simply won't cover every possible nutrient/compound you'd need from food.
It'll be healthier and more enjoyable just to eat actual food. Our understanding of nutrition is growing, but we're not at the point where we can apply reductionism to food. Supplements are extremely effective as part of a diet, but we don't know enough to make a diet completely based upon supplements.
If you're going to go for meal replacement anyway, don't choose soylent. His understanding of nutrition is mediocre at best; as an example, he put no cholesterol at all in his original formula (I have no idea if he's updated it or not).
as an example, he put no cholesterol at all in his original formula (I have no idea if he's updated it or not)
This is actually a bad example; humans can produce cholesterol, and so the FDA does not recommend intake.
Rob Rhinehart's food replacement Soylent now has a crowdfunding campaign.
If you're interested in one or more of these benefits, send in some money! There is also a new blog post.