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From what I've read (I think in the most recent Ars Technica article on it, not counting today's 2.0 one), soylent has to sit for a while in the fridge after you make it or it's absolutely awful.

True. I'm on my first batch of 1.5 right now. The instructions are pretty clear about it needing to be cold. Room-temperature, the Soylent mix is pretty gnarly (think chalk), but once properly chilled it pretty much tastes like nothing.

People will pay a premium for convenience.

Also the convenience could allow them to sell these as individual drinks in grocery stores and convenience stores.

Soylent has a better texture after hydrating for some time.

It also goes bad in 3-4 days, even refrigerated.

That probably won't happen to the bottles, since they can make them sterile. When you mix it yourself you let microbes from the air get in.