I have a few questions

Back in the days I had a turtle and made a similar food (he loved it, but died way to young - of drowning)

I put in dried shrimps, gammarus, mealworms and rat-pinkis as well. You can get frozen little whole fish and shrimps in asia shops too.
I put all this inside together with vitamin powder and filets.

IF i ever house a garter snake could I do the same?

(to blend the rat-pinkys ... I am horrified to this very day...)