The main reason slush drinks stay semi-liquid is their high sugar content.
And since this material is a liquid, or a semi-liquid, it will flow into any irregular spaces, and then that layer is sealed against the external environment with a standard material.
It needs only power and a constant feed of semi-liquid construction material.
When swimmers are training twice per day, they should consume 300 to 500 calories of liquid or semi-liquid carbohydrate substance before morning training.
Another drying method for liquids or semi-liquids, including milk, eggs, and instant coffee, is spray drying.