All the above comments and advice is good. But from what you initially wrote I thought you could have a faulty Temp gauge of a faulty temp sensor. Key question is are you continually loosing coolant and having to top up?
A cracked coolant bottle will allow coolant to escape and it's a low cost to replace this - you won't have to drain the system to replace that bottle.
Coolant on the ground by the driver's front wheel could indeed be the bottle or the coolant pump. Have a careful look below the bottle and around the crank pulley for coolant staining. You could also check under the inlet manifold gasket
with a small mirror - and also around the head to block joint.