There is a special rule for plastic water bottles at Erawan Waterfall. If you want to take a water bottle, you must declare it to the park staff at the checkpoint on the way in and show it to them again when you leave. This is to stop a big problem we have had, with people leaving their water bottles all around this beautiful waterfall. If you don't wish to take your bottle in, the checkpoint will hold it for you and you canpick it up on your way out. We appreciate your co-operation and thank you for helping to keep Erawan Waterfall clean and tidy.