I’m not sure that is going to work well. Based on my experience making full pitchers (2L pitcher filled with Soylent and 1.6L of water) From your 20oz bottle you’re going to have to drink 6.4oz or about 1/3 of the bottle (leaving 13.6oz). Then your going to have to get 500 calories of Soylent powder in there and shake it up. It probably won’t mix very well if you try to dump all the Soylent in at once so you might have to add a little and shake, add a little more and shake… unitl you get it all in there and mixed.
When I make a pitcher I dump the powder in first and just the powder takes up about 1/2 of the pitcher volume. I imagine it would be very difficult to try and mix if I added all the water first.
Syke’s idea of a blender bottle seems like it would work better. Add the powder to the bottle then buy your bottle of water and add it to that.
Probably not an ideal solution if your looking to be able to throw it all away when your done and not have an empty bottle in your brief case though.
You could try to use something like this:
That shinks down to almost nothing when it’s empty. If your only eating one meal on the go you could fill it with Soylent first, or if they did have 500cal pouches you could dump the Soylent in here and add water. When you’re done you rinse it out and collapse it down.
The bottle that inquirerer posted would work great for on the go if it came with the powder in it and you just add water.