Microphones are fairly heavy, so use an object with some weight. For example, if you are using a water bottle for practice, use a full water bottle rather than an empty one.
[header] How to sing into a microphone [title] Practice with objects similar to a microphone. [step] Even if you don't always have access to a microphone during your solo practice time, you will still get the feel for singing with an object in your hand. [substeps] You can use something like a hairbrush or water bottle to simulate the feeling of holding the microphone while you are singing.