You'll need some supplies in addition to the frozen fish food.
Waffle pattern mold:
I used a silicone pot holder with a grid pattern that I got from Bed Bath and Beyond. They don't seem to carry it online but here's the same one from Amazon
Get a cheap flavor injector anywhere you can. A simple syringe will work but make sure it has a large diameter so the shrimp don't clog up the needle. Bed Bath and beyond
Cutters or sharp scissors:
You'll need these to cut the beveled tip off of the flavor injector needle.
To hold the melted shrimp mixture.
I'm using a shot glass.
Frozen brine shrimp:
Purchased from Petco.
One or more fish to feed: