Thank you jajeanpierre. Sorry for the late reply. I got some oatmeal so it should be fine. Oh, my mealworms colony is go8ng great! I have 6 beetles now, 10 or 15 pupa, and some young mealworms.
Unfortunately I haven't found any other feeder insects. The guy who got me the mealworms told me he's gonna start selling crickets once he gets the proper cages for them, so there might be some hope.
I'm so so lucky to have found this forum and got to talk with many experts here! If it wasn't for the great advice I got here, I don't know what I would've done.
Thank you all so much!