.. Getting ants

You need to go forward with the story until you have a clear idea why you need ants. Come back when you are trying to make Otto waste his wishes.

Good. And you got into his room?

Now, you need some sweet substance to lure the ants. ( Take the syrup from the kitchen. )

Have you ever taken ants from an anthill? You could use a stick for the job.

Take the fishing rod from Otto's room and combine it with the syrup. Use the syrup's rod on the anthill to get ants.