What about water on a hot day?
Can't the 14 year old drink over priced coffee in the car?
Me Me Me ~ that's the trouble with you wimmin. 
What about my good reason to stop at a pub?
You cannot buy over priced coffee in North Wales ~ it hasn't reached here yet and by the time it does she'll have her own car to drink it in.
You say that but I'm 28 and still don't have my own car to drink over priced coffee in.
Why can't you drink in the car and stop at the pub?
What if it is a really hot day and dehydration is an issue?
Is this really so that you don't have to keep stopping for "pit stops"?
Are you telling me that *$ hasn't made it to Wales yet? 
Is this another reason I should be adding to my don't go there list? 
If we are talking Starbucks et al ~ the nearest is in Chester I understand. The nearest "Costa Coffee" is on the M56 on route to Manchester and well inside England. It'll take another 14 years for them to catch up this side of the border ~ not enough of a customer base you see. Different down in Cardiff ~ they think they are a metropolis.
FFS Rhyl has only just (last month) got a Pizza Hut but McDonalds we can do you.

We do have a "National Milk Bar" in Rhyl that has an old fashioned expresso "frothy coffee" machine.
Dehydration is not an issue ... when did it ever get that hot in Wales? We go out in the car, we stop for toilets and have drinks. The more they drink the more often we have to stop for toilets. Pubs have toilets. They get a coke and a pee & I get a pint. Nice little afternoon out. Anyway she is 14 ~ when did any 14 year old want to go out with their father unless it is to spend his money on things they don't actually want her to have?