It's not that bad...
I've been on the soylent (1.5 I guess) for about 4 months now, using it just for lunch. I've found it most palatable when you use about 25% less water than they recommend, add a sachet of hot chocolate powder to it, make it about 2 hours before you intend to consume it and add a handful of ice to the mixture before shaking it. It's still largely unappealing; but I like that I can stay in bed for an extra 15 mins (not having to prepare a lunch), and it's considerably cheaper (both in a time sense and $$$) than going down to the food court at the office complex/leaving the building to go find food. I still go out with the team on Fridays, but for Monday to Thursday, soylent worms out at about $2.50 a day and certainly satisfies my appetite.