You should tell him to drink more water, wear warm clothes.

来源：这是一种基本的生活提示。

Example sentences in Engpsh:

Make sure you drink enough water and wear warm clothes during cold weather.
Don't forget to hydrate and dress in layers to stay warm.

Example sentences in Chinese:

在寒冷的天气里，请确保你喝足够的水，穿暖和的衣服。
别忘了保持水分，多穿几层衣服保暖。