Using a empty shampoo bottle and your drill, drill a small hole on both sides of the shampoo bottle.
This is where the food will fall out, so you should test if food falls out by filling it up, and rotating it while holding it horizontally
DONT DRILL TOO BIG OF A HOLE!
Your fish will end up fat!
Drill a hole small enough so only 1-5 pellets fall out, depending on the size or number of fish you have