Fruit Fly Mixture went moldy

[meow_mix450]

Hey
My fruit fly mixture went moldy and didnt go to well. I didnt know where i can get yeast(pretty dumb), spirulina(dont know what it is or where to purchase this product), and calcium cabonate(again i dont know where to purchase this product). Could this be why it went moldy? So could anyone tell me where i my be able to find these products? Or have a easyer recipe that would work? I got this from my friend from another fourm. Also I know the recipe from"understory enterprises" Also when they say 6 cups of mash potatoes do most people meen the ones with flake and it takes 8mins to make?

Thanks

(My Friends Recipe)
6 cups instant mashed potatoes
1/2 c. powdered sugar
12-16 oz jar of applesauce
32 oz bottle of white vinegar
3 envelopes active dry yeast (hold 1 packet till final step)
1/2 cup honey
1/4 cup bee pollen powder
1 T spirulina
1 T calcium carbonate

Meow