What color fluid on the floor? What color coolant in the car? if clear it could be condensation from the climate control system. Check aux water pump and under pass front carpet could be heater core.

I use Amsoil Coolant mixed 50/50. It has a yellow tint to it and is easily recognizable. I felt the fluid on the floor with my hands, it was, without a doubt, coolant. I checked the carpet on the front passenger side yesterday, dry as a bone.

UPDATE: I just drove the car for about twenty minutes, came home and looked under the car and saw NO LEAKS. Weird.