Sophia, The forumla I get is stuff you buy. But you could probably make something pretty equivalent by mixing up milk, soymilk, protein powder, some water soluble fiber (such as Metamucil here--I don't know what it would be called in Greece, maybe some honey, and a ground up mutivitamin. If you are blending up fruit, if your PEG is as narrow as mine, I'd recommend first running it through a sieve with a fairly tight mesh so that you get out any of the chunks of fiber that could clog up your tube. Same with any liquid with ground up meat in it.

Nelie