Hello! Yes, that's a common belief here. The idea is that pouring water into the durian husk and drinking it can help reduce the "heatiness" from the fruit. Many locals swear by this trick, and while there's no scientific evidence to back it up, it might be worth a try if you experience heatiness after eating durian.
However, it's important to also just stay hydrated in general. Drink plenty of plain water to balance out the rich, creamy texture of durian. Some say eating mangosteen after durian can also help balance the heatiness because it's known as a "cooling" fruit.
So, why not give it a go? Sometimes these traditional methods can be quite fun to try! Have you tested this method before?