[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. 
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.