Hi, as a start I'll offer a few links to address the first issue you address, that of coffee enemas. There is a lot of information on the Internet on this subject and you may want to just put "coffee enema" into a Google search (Google it!), but here's some you may find helpful:
If your username "thirteen" is related to your age, I strongly encourage you to discuss this topic with your parents or other adult family member, or your school nurse or health teacher before doing anything on your own beyond searching for information.
There are potential complications that you should discuss before any experimentation.