How the do you fix a water leak?

Answer 1

Water leaks can be frustrating. But while I can empathize, there are so many kinds of "leaks" that it is impossible to help much online, especially without any details.

If the location of the leak is obvious, you'd simply need to repair the pipe. If it's in a section of pipe between joints, you might need to replace that section. If it is at a joint, the compound may have deteriorated at the threads of the joint.

One way to find small leaks is to make a can of very sudsy water using dishwashing liquid--- you want it to be bubbly. Slowly pour small amounts over the pipe, especially at joints, and watch carefully for air in the pipe making the soapy water bubble. When you locate the leak, you then decide how to best address it.

However, it may be easier and less costly of your time and nerves to just call a plumber and let them figure it out.