My Jeep has been leaking water for about eight hours parked

Have you looked at the fluid closely? Is it green like anti-freeze and have that sweetish smell to it? Does it look like plain water?
Does it come from drivers' or passenger side of car?
How much and how often do you add water?
Do you have a temperature gauge in your truck?

It could be A/C condensation running out a drain hose which is on passenger side. However you are losing fluid?

I will watch for your reply and get back ASAP.

I hope all turned out well for oyu.