I'm also trying making a total food replacement this summer. Recommendation for people trying to make their own: start by buying just the macronutrients (oil / carbs / protein), and finding a blend you'll be okay with consuming. It's unlikely that the micronutrients will make it appreciably tastier, so if you can't find one you like without putting the micronutrients in it then you should abort. (The micronutrients represent a far more significant capital outlay, if you buy the ingredients separately rather than going with a multivitamin.)
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.