Coolant leak not from a hose or connector

[Noah1221]

I recently found a spot in my driveway and so I looked under my truck and there was coolant on the underbody of the vehicle all the way back just before the rear wheels, I’ve checked around the water pump, pulleys, heater core, all the hoses and there’s nothing around the spot of the coolant drip that would leak coolant and it is dripping off of a bolt. Will add a picture for reference.

 

[Scram1500]

Have you checked the heater core?

 

[sambell3269]

As an engineer in Australia, I am working with a company which has a lot of distance from my home. For it, I want to buy a used car because of the low budget. Please suggest to me which is the best option for me.