2003 Jaguar Xj8 Water was coming into the foot well

2003 Jaguar Xj8 Water was coming into the foot well dripping onto my foot while driving this obviously caused me some concern! However, the problem seems to have stopped. I am now getting an engine coolant low message on my dashboard, I obtained some engine coolant from my jag dealer and used the whole bottle to top up the reservoir which looked pretty empty! I did not add any water to the mixture just the engine coolant bottle. Should I have done this? Is the leak into the foot well and engine coolant low message related? When are I start the engine I do not seem to get smoke from the radiator or exhaust.