Bottled water refilled and sold as new. I went to buy bottled water and when i was about to pay he suggested cold bottled water from the fridge (it was kinda hidden in the corner), for the same price. I thought "wow, this is a considerat person, maybe he saw me glance at the fridge....". When I arrived at my hostel and was about to open the bottle i noticed the water being filled all the way up (noticed because i did not want to spill any...) and on closer inspection i noticed that the cap was already opnened, it was just one plastic thingy holding the cap in place. I could see grains of sand on the inside om the cap. The bottle hade definetly been refilled. It was only 10 VND.