Hope i am not coming across as being "annoying"....

I am supposed to be getting some dekayi's , before they arrive... I want to have the correct food for them. I already have a tank, clean & ready!

I know they eat earthworms, slugs... but is Canadian Night crawlers bad?
We don't have much of worms or slugs here at my house, we haven;t had any rain. our land is DRY, & the grass is brown.

Does anyone have any suggestions to what else I can feed the dekayi's & any online sites that sell, earthworms, & slugs?

Any help would be appreciated!! Thank You