My experience is similar to others, water in jugs at school, tea and water at home (I loathe milk).
When we lived in the Far East there were jugs of iced water and, often, lime and water in the fridge and we drank more there. As I grew up I started drinking much more because of a bowel problem I had.
My parents, particularly my mother, continued to drink relatively little and all my parents drank in their later years was coffee, with or after each meal and occasionally between meals. Both of them developed bladder cancer, although it was discovered early in both so never fully developed. Whether their lack of adequate fluids, or the fact that they only ever drank coffee contributed to the development of bladder cancer I do not know, but my sister I would like to know to find out whether we have a higher than average chance of getting bladder cancer