Drinking warm water every day is healthy.
The informant heard this from her elementary school friends mother from Thailand. She does not believe in this remedy and does not understand it.
Perhaps the Thai culture wants people to stay hydrated by drinking water since Thailand is such a warm place. However, in Holland it is often cold so drinking cold water may not be as appealing, so perhaps the mother changed the remedy to warm water to adjust to her new climate. Thai people are also known for their tea so perhaps drinks that remind them of tea, like warm water, express their culture so the drink is encouraged.