Heal Capsule

Heal Capsules are an item found in Lifeline. One of these will replenish about 3/4 of your HP, making it the most efficient way of restoring health in the game. The way Rio describes them, they're more palatable than your standard MRE ration, but apparently not by much.

The game describes them as "Portable emergency food rations. A quick and efficient means of replenishing water, electrolytes, minerals, etc". A real-world equivalent of this would be Soylent, a product which seeks to achieve the same purpose. This, of course, means that Rio is one of gaming's most iconic soy boys.