What. is considered non solid. food ?

Liquid: Anything that pores like a liquid. No chunks.

Liquids,etc.: Clear Liquid diets are non-solid. Usually broth, jello, clear juices without fiber, water, soda, tea etc. Then there are full liquid diets when you can have milk, cream soaps, etc. Depends on what you are treating. Ask for more info after giving us some more details about why and what the purpose is in your case.