How long after mixing the (vegan) powder with water will it still stay consumable?
Does it help if I put it into the fridge?
I’m thinking about preparing shakes for a couple days in advance to save even more time (batch work is efficient).
Also last week I spontanously went to a restaurant with a friend while having a prepared shake with me and I was not sure if I can consume it the next day or if I have to dump it.
You can definitely premix your shakes if you keep them in the fridge 
They should be save to eat after saving them for about 24 hours at least.
Okey good to know.
I would love to be able to do it multiple days ahead.
How do I know that it is no longer save to eat?
I’m curious to experiment. 
Other than rancid smell/taste, you should consider how much of your diet is Plenny. As soon as you can sense the rancidity, it was already degraded. Similarly, I don’t trust every single lone ingredient in the vitamin/mineral mix to stay high quality in water/air for long, and you need those nutrients.
My diet is about 80-100% plenny depending on the circumstances.
On the soylent reddit they say it says 2 days mixed on the package but some anecdotal evidence suggest that it stays good for 4-5 days in the fridge.
I’ll make some experiments.
Hello, I was wondering how the experiments went.
I’m curious how long it will stay right when it’s not refrigerated. Since I want to pre mix at home and since I work as a train driver I don’t always have a refrigerator at work. On average I will eat it 5/6 hours after making it at home probably.
Would definitely love to hear about those experiments @Lerkes!
@Dr_Jefferson, we have a general rule of thumb for this: 12 hours unrefrigerated - 24 hours refrigerated!