It is pretty commonplace to sell hot water in my country?
Because bringing a heater with you is hard, the places which sell tea will also fill up your cup with hot water. For a fair price usually +5TL (~0.1 cent) more compared to bottled water of the same amount.
I can bring a heater and spend my university's electricity for it but why would I so that when hot water is already very cheap.
edit: I just remembered my school's water dispensers have a hot water tap. Students drain those very quickly though so I gotta go there the second my lecture ends