I am saying by all means stock groceries bread and milk but also have a small selection of motorists requisites like fuses, screen wash, oil possibly jump leads tow rope instant puncture repair etc
That is or should be an added service. If I am driving a car I go to a garage primarily to get fuel or some aid for the car to keep me going on my journey. Is that too much to expect?
I would assume that the OP checked his bottle before leaving home but used a lot driving up due to the bad weather, very sensible to check before driving home also especially as it is virtually all motorway and spray from the road.
Would have been cheaper to have stopped at Tesco or similar before leaving and bought a 1.5ltr own still water. Burst pipe in HH yesterday morning so had to nip to Sainsbury to get water to make a cuppa but it was only 20p.