1999 Chrysler Town and Country unsure

What led up to this? Was it raining? Were you using the air conditioning? Did you drive through a river?

Brake fluid and power steering fluid also look like water. If you're sure it's water and not one of those fluids, suspect the drain for the air conditioning system is plugged. Start by looking under the vehicle for a 4" long rubber hose with a 90 degree bend hanging down on the passenger side of the firewall. Squeeze the end of that hose to open it up and let any debris fall out. If nothing comes out, squeeze the metal ring on the other end of the hose to remove it, then stick a pencil into the drain tube to dislodge whatever is blocking it.