Can I use regular purified water to inject lips and make them fuller?

Thank you for sharing your question. in short this would be a dangerous process as purified does not mean sterile and because of the numerous risks entailed with any injection.

you need fillers for plumping. if you do not want that then see emeragecosmetics lip essentials with lucy and co hydrating lip plumping. Best, Dr. Emer.

This is a very bad idea. I assume you do not mean purified water but rather sterile water for injection. This is used an dilutent for medical purpose. It is not intended, investigated, or approved for temporary enlargement of the lips. Water is hypotonic compared to the body's cells. Injecting sterile water is very painful (occasionally accidentally used to dilute botox). It actually kills fat cells and will actually damage the volume of the lip. Occasionally, I hear doctors who advocate injecting sterile injectable saline into a lip to give someone an idea of what fill might do. I actually think this is a terrible idea. Most people get it. Once you have injected them it is not possible to accurately perform a filler service. These water or salt water injections are rapidly absorbed by the body so it is not even practical as a short term filler. Don't do this.