I have a water leak on front driver side floor of my 92 Buick Century. It is not coolant or from rain. Any help?

It's either the condensation from your air conditioning or you have a windshield leak. Have you been running the A/C? If so, the first thing to do is see if the drain hose is plugged. You have to do that from under the vehicle. Poke something flexible up the drain and see if water comes out. If so, then flush it with clean water. Do NOT use bleach.