Plain hot water (boiled water), often cooled slightly and drunk to warm the body or soothe the stomach.
風邪のときは白湯をゆっくり飲むと喉にやさしい。
When you have a cold, slowly drinking warm boiled water is gentle on the throat.
朝はまず白湯を一杯飲む習慣がある。
I have a habit of drinking a cup of warm boiled water first thing in the morning.
赤ちゃんには熱くない白湯を与えてください。
Give the baby warm (not hot) boiled water.
白湯はただ沸かした水なので、味付けはしない。
White boiled water is simply boiled water, so it isn't flavored.