Water leak?

Hi, I have a 1999 Discovery. The head gasket went, so a new one has been order fixed by a highly recommended Landrover mechanic. However, the water bottle is always low, I refill it before every journey, even if only a mile or two, but i can not see a leak or puddle on the floor, any ideas? As I want to sell it ASAP. Cheers.

Could be a leak in the heater matrix and it's p!ddlin' all over your footwells.

Check if the carpets are damp...