It's possible to get all your potassium from potassium citrate, but then you have to up the salt content to get as much chloride you need, and that will raise the sodium above what it needs to be. I don't add oils or any other fats except what's in the seeds (plus fish oil pills), but you certainly can play with increased fat and cut back on carbs.

Here's how I make this recipe work with HAES (trademark) intuitive eating: I mix the micronutrients separate from the macros and make sure I eat all of them over the course of the day, usually in 3-4 meals. At each meal I add however much of the macro blend as I feel hungry for. If I'm hungry again late in the day after all my micronutrients are gone, I mix up more of just the cereal/protein/seed blend.

Items that have 0 as the amount are optional variations. It doesn't matter very much about the oats/masa/wheat proportions. Masa is the cheapest and oats are very cheap too, but shredded wheat adds crunchy zing. You can put in various flavorings: vanilla, chocolate, cinnamon, vinegar.

I grind the flax seed but not the chia. It isn't necessary to cook the oats.

I like to add fresh sprouts in case the phytochemicals do me some good. If you're eating any other vegetables or fruits along with the soylent, you probably don't need to put in vitamin C powder at all, but it doesn't hurt.

Even though I'm calling it "gruel," I actually don't like to put that much water in my recipe. I dissolve the micronutrients (except for the pills) in a small amount of water then I drizzle that into the macroingredients, adding more water as needed until I get a cookie-dough consistency, then I eat it. This is partly a matter of taste and partly because of those lab-rodent studies that some have said indicate the need for chewing. If you want a drinkable recipe, you'll probably want to use oat flour instead of oats. Otherwise, it'll be kind of sludgy.