Alternatively, cut a larger hole for air and then cover it with tissue paper, taped down around the edges, which will still allow air to pass through without letting the fly out. [1] X Research source
Alternatively, plug it up with a small eraser or even silly putty.
Quickly place the lid on to capture the fly.
However, while flies prefer warmer temperatures, they’ll do just fine in temperatures down to about 68 °F (20 °C). At 59 °F (15 °C), they’ll stop most activity.
You won’t need to feed your fly much more than a pea-sized amount of food each day, but you should make sure it has food in its container at all times, as it will want to eat 2-3 times a day.
If you don’t have a syringe, use a straw to move food into the cap instead.
Use a syringe or a clean straw to place the water in the bottle cap.
Your fly may rest on the bottom of the container’s ceiling, for instance, or even just on the bottom of the container.
If you see eggs, you may want to take them outside. Otherwise, you could have hundreds of flies on your hands.
However, you don’t have to keep your fly the whole time. You can release it whenever you want, and it will do just fine on its own!
