You clearly have no freaking idea what you're talking about if you fear a nutritional drink more than living in prison. Soylent is far better tasting/for you than many of the meals one is fed in prison. Truly spoken like someone who has no reference for a complete loss of freedom. I would drink soylent for the rest of my life of it was that or prison.
The lack of change is terrifying though. Eating sushi 24/7 is not pleasant either.