Fruit flies have several advantages over hatchling crickets as a live food.
They stay small, they require no maintenance once a culture's set up and it's cheap and easy to produce astronomical numbers in very little space. Alternatively, a heated knife can be used to cut the hole with 5cm thick plastic foam to plug it. The following ingredients are sufficient for three jars. These ingredients can be increased or reduced proportionately depending on the number of cultures required. Yeast is not necessary and there are no strong unpleasant smells.