Where is the u-fill-your-own-jug water sales located and how much for a gallon? Am I correct it is a pay as you go type dispenser?

In the back by the back bathrooms not up front. I am not sure if the cost since I've never gotten it.

End of registers?? Against wall?? I don't recall seeing a water jug filling facility anywhere near registers or a wall????

Ask them at the store