It does require you to go to the supermarket, quickly buy some ingredients, and mix them together.

Here is an example: You can just buy oats, skim milk powder, peanuts (a bit better if you buy them crushed, or crush them), raisens, and dehydrated fruit & berries. I also add almonds, walnuts, chocolate, coconut. It works out to b/w 25-50cents a meal if you buy at Costco, and is very healthy. You can add sugar if you want (I add a little, and a very small amount of salt).

You can also customize to your heart's desire. Replace milk powder with whey powder. Peanuts with almonds, flax for omega 3s, etc.

There you have it - The wisdom to outcompete soylent on price, nutrition, and taste, and all by a lot.