I once fought a shop keeper for that 2 rupees he was charging on the coke 500ml bottle.
I told him, he got the fridge free from Coca cola (if he takes 10K bottles or so - I am not sure, but heard somewhere), and do he really thinks 2 rupees electrcity was used to cool this bottle?
Then he started other BS like, everybody charging that extra. I asked for bill with that 2 rupees, to which he refused.
He was aged guy, so I left without buying. But had to bought from another shop paying that 2 rupees.
Buying non-fridge bottle makes sense if you are taking it home. But when you are on the road, that cooling charge is unavoidable.